231225405402 has 32 divisors (see below), whose sum is σ = 467571992832. Its totient is φ = 76222808064.

The previous prime is 231225405391. The next prime is 231225405403. The reversal of 231225405402 is 204504522132.

It is a self number, because there is not a number n which added to its sum of digits gives 231225405402.

It is not an unprimeable number, because it can be changed into a prime (231225405403) 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, 622618 + ... + 922010.

It is an arithmetic number, because the mean of its divisors is an integer number (14611624776).

Almost surely, 2^231225405402 is an apocalyptic number.

231225405402 is an abundant number, since it is smaller than the sum of its proper divisors (236346587430).

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

231225405402 is a wasteful number, since it uses less digits than its factorization.

231225405402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300822.

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 231225405402 its reverse (204504522132), we get a palindrome (435729927534).

The spelling of 231225405402 in words is "two hundred thirty-one billion, two hundred twenty-five million, four hundred five thousand, four hundred two".