91253251 has 2 divisors, whose sum is σ = 91253252. Its totient is φ = 91253250.

The previous prime is 91253237. The next prime is 91253269. The reversal of 91253251 is 15235219.

It is a weak prime.

It is an emirp because it is prime and its reverse (15235219) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91253251 - 2¹⁵ = 91220483 is a prime.

It is not a weakly prime, because it can be changed into another prime (91253221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45626625 + 45626626.

It is an arithmetic number, because the mean of its divisors is an integer number (45626626).

Almost surely, 2^91253251 is an apocalyptic number.

91253251 is a deficient number, since it is larger than the sum of its proper divisors (1).

91253251 is an equidigital number, since it uses as much as digits as its factorization.

91253251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 28.

The square root of 91253251 is about 9552.6567508730. The cubic root of 91253251 is about 450.2110137932.

The spelling of 91253251 in words is "ninety-one million, two hundred fifty-three thousand, two hundred fifty-one".