231106591 has 2 divisors, whose sum is σ = 231106592. Its totient is φ = 231106590.

The previous prime is 231106549. The next prime is 231106607. The reversal of 231106591 is 195601132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231106591 - 2²¹ = 229009439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231106501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115553295 + 115553296.

It is an arithmetic number, because the mean of its divisors is an integer number (115553296).

Almost surely, 2^231106591 is an apocalyptic number.

231106591 is a deficient number, since it is larger than the sum of its proper divisors (1).

231106591 is an equidigital number, since it uses as much as digits as its factorization.

231106591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 231106591 is about 15202.1903356062. The cubic root of 231106591 is about 613.6736046707.

The spelling of 231106591 in words is "two hundred thirty-one million, one hundred six thousand, five hundred ninety-one".