91974499 has 2 divisors, whose sum is σ = 91974500. Its totient is φ = 91974498.

The previous prime is 91974473. The next prime is 91974511. The reversal of 91974499 is 99447919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91974499 - 2⁷ = 91974371 is a prime.

It is not a weakly prime, because it can be changed into another prime (91974409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45987249 + 45987250.

It is an arithmetic number, because the mean of its divisors is an integer number (45987250).

Almost surely, 2^91974499 is an apocalyptic number.

91974499 is a deficient number, since it is larger than the sum of its proper divisors (1).

91974499 is an equidigital number, since it uses as much as digits as its factorization.

91974499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 52.

The square root of 91974499 is about 9590.3336229768. Note that the first 3 decimals coincide. The cubic root of 91974499 is about 451.3940293202.

The spelling of 91974499 in words is "ninety-one million, nine hundred seventy-four thousand, four hundred ninety-nine".