231216402 has 16 divisors (see below), whose sum is σ = 462651552. Its totient is φ = 77035680.

The previous prime is 231216389. The next prime is 231216421. The reversal of 231216402 is 204612132.

It is a super-2 number, since 2×231216402² = 106922049107651208, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6753 + ... + 22539.

It is an arithmetic number, because the mean of its divisors is an integer number (28915722).

Almost surely, 2^231216402 is an apocalyptic number.

231216402 is an abundant number, since it is smaller than the sum of its proper divisors (231435150).

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

231216402 is a wasteful number, since it uses less digits than its factorization.

231216402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18233.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 231216402 is about 15205.8015901826. The cubic root of 231216402 is about 613.7707855740.

Adding to 231216402 its reverse (204612132), we get a palindrome (435828534).

The spelling of 231216402 in words is "two hundred thirty-one million, two hundred sixteen thousand, four hundred two".