231216532 has 12 divisors (see below), whose sum is σ = 408210516. Its totient is φ = 114584960.

The previous prime is 231216521. The next prime is 231216599. The reversal of 231216532 is 235612132.

It can be written as a sum of positive squares in 2 ways, for example, as 2178576 + 229037956 = 1476^2 + 15134^2 .

It is a super-2 number, since 2×231216532² = 106922169340214048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231216497 and 231216506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255319 + ... + 256222.

It is an arithmetic number, because the mean of its divisors is an integer number (34017543).

Almost surely, 2^231216532 is an apocalyptic number.

It is an amenable number.

231216532 is a deficient number, since it is larger than the sum of its proper divisors (176993984).

231216532 is a wasteful number, since it uses less digits than its factorization.

231216532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511658 (or 511656 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 231216532 is about 15205.8058648662. The cubic root of 231216532 is about 613.7709006036.

Adding to 231216532 its reverse (235612132), we get a palindrome (466828664).

The spelling of 231216532 in words is "two hundred thirty-one million, two hundred sixteen thousand, five hundred thirty-two".