1231320331 has 8 divisors (see below), whose sum is σ = 1239721200. Its totient is φ = 1222948320.

The previous prime is 1231320317. The next prime is 1231320427. The reversal of 1231320331 is 1330231321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231320331 - 2¹⁷ = 1231189259 is a prime.

It is a super-2 number, since 2×1231320331² = 3032299515067899122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231320299 and 1231320308.

It is not an unprimeable number, because it can be changed into a prime (1231380331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82125 + ... + 95953.

It is an arithmetic number, because the mean of its divisors is an integer number (154965150).

Almost surely, 2^1231320331 is an apocalyptic number.

1231320331 is a deficient number, since it is larger than the sum of its proper divisors (8400869).

1231320331 is a wasteful number, since it uses less digits than its factorization.

1231320331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14429.

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

The square root of 1231320331 is about 35090.1742799890. The cubic root of 1231320331 is about 1071.8245085096.

Adding to 1231320331 its reverse (1330231321), we get a palindrome (2561551652).

The spelling of 1231320331 in words is "one billion, two hundred thirty-one million, three hundred twenty thousand, three hundred thirty-one".