91625251 has 2 divisors, whose sum is σ = 91625252. Its totient is φ = 91625250.

The previous prime is 91625213. The next prime is 91625263. The reversal of 91625251 is 15252619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91625251 - 2⁹ = 91624739 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91625351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45812625 + 45812626.

It is an arithmetic number, because the mean of its divisors is an integer number (45812626).

Almost surely, 2^91625251 is an apocalyptic number.

91625251 is a deficient number, since it is larger than the sum of its proper divisors (1).

91625251 is an equidigital number, since it uses as much as digits as its factorization.

91625251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 31.

The square root of 91625251 is about 9572.1079705570. The cubic root of 91625251 is about 450.8219561623.

The spelling of 91625251 in words is "ninety-one million, six hundred twenty-five thousand, two hundred fifty-one".