231664530 has 48 divisors (see below), whose sum is σ = 586825344. Its totient is φ = 58523040.

The previous prime is 231664529. The next prime is 231664547. The reversal of 231664530 is 35466132.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135 + ... + 21525.

It is an arithmetic number, because the mean of its divisors is an integer number (12225528).

Almost surely, 2^231664530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231664530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293412672).

231664530 is an abundant number, since it is smaller than the sum of its proper divisors (355160814).

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

231664530 is a wasteful number, since it uses less digits than its factorization.

231664530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21439 (or 21420 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 231664530 is about 15220.5298856512. The cubic root of 231664530 is about 614.1670526932.

The spelling of 231664530 in words is "two hundred thirty-one million, six hundred sixty-four thousand, five hundred thirty".