1231331320 has 16 divisors (see below), whose sum is σ = 2770495560. Its totient is φ = 492532512.

The previous prime is 1231331263. The next prime is 1231331371. The reversal of 1231331320 is 231331321.

It is a super-2 number, since 2×1231331320² = 3032353639225884800, which contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 15391602 + ... + 15391681.

Almost surely, 2^1231331320 is an apocalyptic number.

1231331320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231331320 is an abundant number, since it is smaller than the sum of its proper divisors (1539164240).

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

1231331320 is a wasteful number, since it uses less digits than its factorization.

1231331320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30783294 (or 30783290 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1231331320 is about 35090.3308619340. The cubic root of 1231331320 is about 1071.8276970231.

Adding to 1231331320 its reverse (231331321), we get a palindrome (1462662641).

Subtracting from 1231331320 its reverse (231331321), we obtain a palindrome (999999999).

The spelling of 1231331320 in words is "one billion, two hundred thirty-one million, three hundred thirty-one thousand, three hundred twenty".