91915783 has 2 divisors, whose sum is σ = 91915784. Its totient is φ = 91915782.

The previous prime is 91915771. The next prime is 91915799. The reversal of 91915783 is 38751919.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91915783 is a prime.

It is a super-2 number, since 2×91915783² = 16897022329006178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91915723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45957891 + 45957892.

It is an arithmetic number, because the mean of its divisors is an integer number (45957892).

Almost surely, 2^91915783 is an apocalyptic number.

91915783 is a deficient number, since it is larger than the sum of its proper divisors (1).

91915783 is an equidigital number, since it uses as much as digits as its factorization.

91915783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 43.

The square root of 91915783 is about 9587.2719268831. The cubic root of 91915783 is about 451.2979530739.

The spelling of 91915783 in words is "ninety-one million, nine hundred fifteen thousand, seven hundred eighty-three".