231881652 has 18 divisors (see below), whose sum is σ = 586145378. Its totient is φ = 77293872.

The previous prime is 231881647. The next prime is 231881677. The reversal of 231881652 is 256188132.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 215913636 + 15968016 = 14694^2 + 3996^2 .

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

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: 6441157 = 231881652 / (2 + 3 + 1 + 8 + 8 + 1 + 6 + 5 + 2).

It is a congruent number.

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, 3220543 + ... + 3220614.

Almost surely, 2^231881652 is an apocalyptic number.

It is an amenable number.

231881652 is an abundant number, since it is smaller than the sum of its proper divisors (354263726).

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

231881652 is a wasteful number, since it uses less digits than its factorization.

231881652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6441167 (or 6441162 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 231881652 is about 15227.6607527223. The cubic root of 231881652 is about 614.3588638739.

The spelling of 231881652 in words is "two hundred thirty-one million, eight hundred eighty-one thousand, six hundred fifty-two".