91874831 has 2 divisors, whose sum is σ = 91874832. Its totient is φ = 91874830.

The previous prime is 91874821. The next prime is 91874833. The reversal of 91874831 is 13847819.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91874831 - 2⁶ = 91874767 is a prime.

It is a super-2 number, since 2×91874831² = 16881969142557122, which contains 22 as substring.

Together with 91874833, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91874833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45937415 + 45937416.

It is an arithmetic number, because the mean of its divisors is an integer number (45937416).

Almost surely, 2^91874831 is an apocalyptic number.

91874831 is a deficient number, since it is larger than the sum of its proper divisors (1).

91874831 is an equidigital number, since it uses as much as digits as its factorization.

91874831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 91874831 is about 9585.1359406114. The cubic root of 91874831 is about 451.2309196128.

The spelling of 91874831 in words is "ninety-one million, eight hundred seventy-four thousand, eight hundred thirty-one".