231866532 has 18 divisors (see below), whose sum is σ = 586107158. Its totient is φ = 77288832.

The previous prime is 231866507. The next prime is 231866543. The reversal of 231866532 is 235668132.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 188622756 + 43243776 = 13734^2 + 6576^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 6440737 = 231866532 / (2 + 3 + 1 + 8 + 6 + 6 + 5 + 3 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3220333 + ... + 3220404.

Almost surely, 2^231866532 is an apocalyptic number.

It is an amenable number.

231866532 is an abundant number, since it is smaller than the sum of its proper divisors (354240626).

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

231866532 is a wasteful number, since it uses less digits than its factorization.

231866532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6440747 (or 6440742 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 231866532 is about 15227.1642796681. The cubic root of 231866532 is about 614.3455103552.

The spelling of 231866532 in words is "two hundred thirty-one million, eight hundred sixty-six thousand, five hundred thirty-two".