231358639 has 2 divisors, whose sum is σ = 231358640. Its totient is φ = 231358638.

The previous prime is 231358591. The next prime is 231358643. The reversal of 231358639 is 936853132.

231358639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231358639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231458639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115679319 + 115679320.

It is an arithmetic number, because the mean of its divisors is an integer number (115679320).

Almost surely, 2^231358639 is an apocalyptic number.

231358639 is a deficient number, since it is larger than the sum of its proper divisors (1).

231358639 is an equidigital number, since it uses as much as digits as its factorization.

231358639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 40.

The square root of 231358639 is about 15210.4779346344. The cubic root of 231358639 is about 613.8966172177.

The spelling of 231358639 in words is "two hundred thirty-one million, three hundred fifty-eight thousand, six hundred thirty-nine".