231604591 has 2 divisors, whose sum is σ = 231604592. Its totient is φ = 231604590.

The previous prime is 231604589. The next prime is 231604601. The reversal of 231604591 is 195406132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231604591 - 2¹ = 231604589 is a prime.

Together with 231604589, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231604291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115802295 + 115802296.

It is an arithmetic number, because the mean of its divisors is an integer number (115802296).

Almost surely, 2^231604591 is an apocalyptic number.

231604591 is a deficient number, since it is larger than the sum of its proper divisors (1).

231604591 is an equidigital number, since it uses as much as digits as its factorization.

231604591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 231604591 is about 15218.5607400963. The cubic root of 231604591 is about 614.1140799251.

The spelling of 231604591 in words is "two hundred thirty-one million, six hundred four thousand, five hundred ninety-one".