231934639 has 4 divisors (see below), whose sum is σ = 233761024. Its totient is φ = 230108256.

The previous prime is 231934609. The next prime is 231934649. The reversal of 231934639 is 936439132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231934639 - 2⁵ = 231934607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231934609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 913002 + ... + 913255.

It is an arithmetic number, because the mean of its divisors is an integer number (58440256).

Almost surely, 2^231934639 is an apocalyptic number.

231934639 is a deficient number, since it is larger than the sum of its proper divisors (1826385).

231934639 is a wasteful number, since it uses less digits than its factorization.

231934639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826384.

The product of its digits is 104976, while the sum is 40.

The square root of 231934639 is about 15229.4004806493. The cubic root of 231934639 is about 614.4056557806.

The spelling of 231934639 in words is "two hundred thirty-one million, nine hundred thirty-four thousand, six hundred thirty-nine".