1231055120 has 80 divisors (see below), whose sum is σ = 2973224880. Its totient is φ = 473628672.

The previous prime is 1231055117. The next prime is 1231055123. The reversal of 1231055120 is 215501321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1231055117) and next prime (1231055123).

It can be written as a sum of positive squares in 8 ways, for example, as 94556176 + 1136498944 = 9724^2 + 33712^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1231055092 and 1231055101.

It is not an unprimeable number, because it can be changed into a prime (1231055123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261104 + ... + 265776.

It is an arithmetic number, because the mean of its divisors is an integer number (37165311).

Almost surely, 2^1231055120 is an apocalyptic number.

1231055120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231055120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1486612440).

1231055120 is an abundant number, since it is smaller than the sum of its proper divisors (1742169760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231055120 is a wasteful number, since it uses less digits than its factorization.

1231055120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4812 (or 4806 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1231055120 is about 35086.3950841348. The cubic root of 1231055120 is about 1071.7475504526.

Adding to 1231055120 its reverse (215501321), we get a palindrome (1446556441).

The spelling of 1231055120 in words is "one billion, two hundred thirty-one million, fifty-five thousand, one hundred twenty".