231665634 has 12 divisors (see below), whose sum is σ = 501942246. Its totient is φ = 77221872.

The previous prime is 231665561. The next prime is 231665641. The reversal of 231665634 is 436566132.

231665634 is a `hidden beast` number, since 2 + 3 + 16 + 6 + 5 + 634 = 666.

It can be written as a sum of positive squares in only one way, i.e., 178302609 + 53363025 = 13353^2 + 7305^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6435139 + ... + 6435174.

Almost surely, 2^231665634 is an apocalyptic number.

231665634 is an abundant number, since it is smaller than the sum of its proper divisors (270276612).

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

231665634 is a wasteful number, since it uses less digits than its factorization.

231665634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12870321 (or 12870318 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 231665634 is about 15220.5661524136. The cubic root of 231665634 is about 614.1680282984.

The spelling of 231665634 in words is "two hundred thirty-one million, six hundred sixty-five thousand, six hundred thirty-four".