231312210209 has 12 divisors (see below), whose sum is σ = 239328589500. Its totient is φ = 223549858368.

The previous prime is 231312210167. The next prime is 231312210229. The reversal of 231312210209 is 902012213132.

It can be written as a sum of positive squares in 6 ways, for example, as 7242520609 + 224069689600 = 85103^2 + 473360^2 .

It is not a de Polignac number, because 231312210209 - 2¹⁶ = 231312144673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231312210229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 363014 + ... + 770975.

It is an arithmetic number, because the mean of its divisors is an integer number (19944049125).

Almost surely, 2^231312210209 is an apocalyptic number.

It is an amenable number.

231312210209 is a deficient number, since it is larger than the sum of its proper divisors (8016379291).

231312210209 is a wasteful number, since it uses less digits than its factorization.

231312210209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134212 (or 1134175 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 231312210209 in words is "two hundred thirty-one billion, three hundred twelve million, two hundred ten thousand, two hundred nine".