91679251 has 2 divisors, whose sum is σ = 91679252. Its totient is φ = 91679250.

The previous prime is 91679233. The next prime is 91679261. The reversal of 91679251 is 15297619.

It is a strong prime.

It is an emirp because it is prime and its reverse (15297619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91679251 - 2¹¹ = 91677203 is a prime.

It is not a weakly prime, because it can be changed into another prime (91679201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45839625 + 45839626.

It is an arithmetic number, because the mean of its divisors is an integer number (45839626).

Almost surely, 2^91679251 is an apocalyptic number.

91679251 is a deficient number, since it is larger than the sum of its proper divisors (1).

91679251 is an equidigital number, since it uses as much as digits as its factorization.

91679251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 40.

The square root of 91679251 is about 9574.9282503839. The cubic root of 91679251 is about 450.9105038221.

The spelling of 91679251 in words is "ninety-one million, six hundred seventy-nine thousand, two hundred fifty-one".