231075491 has 2 divisors, whose sum is σ = 231075492. Its totient is φ = 231075490.

The previous prime is 231075487. The next prime is 231075497. The reversal of 231075491 is 194570132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231075491 - 2² = 231075487 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231075497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115537745 + 115537746.

It is an arithmetic number, because the mean of its divisors is an integer number (115537746).

Almost surely, 2^231075491 is an apocalyptic number.

231075491 is a deficient number, since it is larger than the sum of its proper divisors (1).

231075491 is an equidigital number, since it uses as much as digits as its factorization.

231075491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 231075491 is about 15201.1674222739. The cubic root of 231075491 is about 613.6460760958.

The spelling of 231075491 in words is "two hundred thirty-one million, seventy-five thousand, four hundred ninety-one".