91367251 has 2 divisors, whose sum is σ = 91367252. Its totient is φ = 91367250.

The previous prime is 91367239. The next prime is 91367329. The reversal of 91367251 is 15276319.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91367251 - 2¹¹ = 91365203 is a prime.

It is not a weakly prime, because it can be changed into another prime (91367351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45683625 + 45683626.

It is an arithmetic number, because the mean of its divisors is an integer number (45683626).

Almost surely, 2^91367251 is an apocalyptic number.

91367251 is a deficient number, since it is larger than the sum of its proper divisors (1).

91367251 is an equidigital number, since it uses as much as digits as its factorization.

91367251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 34.

The square root of 91367251 is about 9558.6218148852. The cubic root of 91367251 is about 450.3984142321.

The spelling of 91367251 in words is "ninety-one million, three hundred sixty-seven thousand, two hundred fifty-one".