1231320120 has 32 divisors (see below), whose sum is σ = 3693960720. Its totient is φ = 328352000.

The previous prime is 1231320107. The next prime is 1231320161. The reversal of 1231320120 is 210231321.

It is a super-2 number, since 2×1231320120² = 3032298475833628800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1231320120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5130381 + ... + 5130620.

Almost surely, 2^1231320120 is an apocalyptic number.

1231320120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231320120 is an abundant number, since it is smaller than the sum of its proper divisors (2462640600).

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

1231320120 is a wasteful number, since it uses less digits than its factorization.

1231320120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10261015 (or 10261011 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1231320120 is about 35090.1712734492. The cubic root of 1231320120 is about 1071.8244472867.

Adding to 1231320120 its reverse (210231321), we get a palindrome (1441551441).

The spelling of 1231320120 in words is "one billion, two hundred thirty-one million, three hundred twenty thousand, one hundred twenty".