231312402 has 32 divisors (see below), whose sum is σ = 517742400. Its totient is φ = 76546944.

The previous prime is 231312401. The next prime is 231312407. The reversal of 231312402 is 204213132.

231312402 is a `hidden beast` number, since 231 + 31 + 2 + 402 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (231312401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7903 + ... + 22914.

It is an arithmetic number, because the mean of its divisors is an integer number (16179450).

Almost surely, 2^231312402 is an apocalyptic number.

231312402 is an abundant number, since it is smaller than the sum of its proper divisors (286429998).

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

231312402 is a wasteful number, since it uses less digits than its factorization.

231312402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30967 (or 30961 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 231312402 is about 15208.9579524700. The cubic root of 231312402 is about 613.8557187680.

Adding to 231312402 its reverse (204213132), we get a palindrome (435525534).

The spelling of 231312402 in words is "two hundred thirty-one million, three hundred twelve thousand, four hundred two".