231012091 has 2 divisors, whose sum is σ = 231012092. Its totient is φ = 231012090.

The previous prime is 231012083. The next prime is 231012101. The reversal of 231012091 is 190210132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231012091 - 2³ = 231012083 is a prime.

It is not a weakly prime, because it can be changed into another prime (231012011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115506045 + 115506046.

It is an arithmetic number, because the mean of its divisors is an integer number (115506046).

Almost surely, 2^231012091 is an apocalyptic number.

231012091 is a deficient number, since it is larger than the sum of its proper divisors (1).

231012091 is an equidigital number, since it uses as much as digits as its factorization.

231012091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 231012091 is about 15199.0819130630. The cubic root of 231012091 is about 613.5899490992.

The spelling of 231012091 in words is "two hundred thirty-one million, twelve thousand, ninety-one".