231937091 has 2 divisors, whose sum is σ = 231937092. Its totient is φ = 231937090.

The previous prime is 231937081. The next prime is 231937093. The reversal of 231937091 is 190739132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231937091 is a prime.

It is a Sophie Germain prime.

Together with 231937093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231937093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115968545 + 115968546.

It is an arithmetic number, because the mean of its divisors is an integer number (115968546).

Almost surely, 2^231937091 is an apocalyptic number.

231937091 is the 8141-st centered heptagonal number.

231937091 is a deficient number, since it is larger than the sum of its proper divisors (1).

231937091 is an equidigital number, since it uses as much as digits as its factorization.

231937091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 231937091 is about 15229.4809826205. The cubic root of 231937091 is about 614.4078209270.

The spelling of 231937091 in words is "two hundred thirty-one million, nine hundred thirty-seven thousand, ninety-one".