1231011120 has 80 divisors (see below), whose sum is σ = 3851226720. Its totient is φ = 325251072.

The previous prime is 1231011113. The next prime is 1231011143. The reversal of 1231011120 is 211101321.

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 (12).

It is a junction number, because it is equal to n+sod(n) for n = 1231011096 and 1231011105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2632 + ... + 49688.

It is an arithmetic number, because the mean of its divisors is an integer number (48140334).

Almost surely, 2^1231011120 is an apocalyptic number.

1231011120 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 1231011120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1925613360).

1231011120 is an abundant number, since it is smaller than the sum of its proper divisors (2620215600).

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

1231011120 is a wasteful number, since it uses less digits than its factorization.

1231011120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47182 (or 47176 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1231011120 is about 35085.7680548681. The cubic root of 1231011120 is about 1071.7347816081.

Adding to 1231011120 its reverse (211101321), we get a palindrome (1442112441).

The spelling of 1231011120 in words is "one billion, two hundred thirty-one million, eleven thousand, one hundred twenty".