91909523 has 2 divisors, whose sum is σ = 91909524. Its totient is φ = 91909522.

The previous prime is 91909511. The next prime is 91909529. The reversal of 91909523 is 32590919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91909523 - 2⁶ = 91909459 is a prime.

It is not a weakly prime, because it can be changed into another prime (91909529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45954761 + 45954762.

It is an arithmetic number, because the mean of its divisors is an integer number (45954762).

Almost surely, 2^91909523 is an apocalyptic number.

91909523 is a deficient number, since it is larger than the sum of its proper divisors (1).

91909523 is an equidigital number, since it uses as much as digits as its factorization.

91909523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 91909523 is about 9586.9454468042. The cubic root of 91909523 is about 451.2877075019.

The spelling of 91909523 in words is "ninety-one million, nine hundred nine thousand, five hundred twenty-three".