11997032831 has 8 divisors (see below), whose sum is σ = 13714803744. Its totient is φ = 10280239200.

The previous prime is 11997032819. The next prime is 11997032843. The reversal of 11997032831 is 13823079911.

It is an interprime number because it is at equal distance from previous prime (11997032819) and next prime (11997032843).

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

It is a de Polignac number, because none of the positive numbers 2^k-11997032831 is a prime.

It is a super-2 number, since 2×11997032831² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11997032431) 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, 217820 + ... + 267281.

It is an arithmetic number, because the mean of its divisors is an integer number (1714350468).

Almost surely, 2^11997032831 is an apocalyptic number.

11997032831 is a deficient number, since it is larger than the sum of its proper divisors (1717770913).

11997032831 is an equidigital number, since it uses as much as digits as its factorization.

11997032831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488641.

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 11997032831 in words is "eleven billion, nine hundred ninety-seven million, thirty-two thousand, eight hundred thirty-one".