231031311209 has 4 divisors (see below), whose sum is σ = 231158044416. Its totient is φ = 230904578004.

The previous prime is 231031311169. The next prime is 231031311223. The reversal of 231031311209 is 902113130132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231031311209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231031311229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63363869 + ... + 63367514.

It is an arithmetic number, because the mean of its divisors is an integer number (57789511104).

Almost surely, 2^231031311209 is an apocalyptic number.

It is an amenable number.

231031311209 is a deficient number, since it is larger than the sum of its proper divisors (126733207).

231031311209 is a wasteful number, since it uses less digits than its factorization.

231031311209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126733206.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 231031311209 in words is "two hundred thirty-one billion, thirty-one million, three hundred eleven thousand, two hundred nine".