231896591 has 2 divisors, whose sum is σ = 231896592. Its totient is φ = 231896590.

The previous prime is 231896551. The next prime is 231896627. The reversal of 231896591 is 195698132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231896591 - 2⁶ = 231896527 is a prime.

It is a super-3 number, since 3×231896591³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231896551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115948295 + 115948296.

It is an arithmetic number, because the mean of its divisors is an integer number (115948296).

Almost surely, 2^231896591 is an apocalyptic number.

231896591 is a deficient number, since it is larger than the sum of its proper divisors (1).

231896591 is an equidigital number, since it uses as much as digits as its factorization.

231896591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 44.

The square root of 231896591 is about 15228.1512666509. The cubic root of 231896591 is about 614.3720569689.

The spelling of 231896591 in words is "two hundred thirty-one million, eight hundred ninety-six thousand, five hundred ninety-one".