91911913 has 2 divisors, whose sum is σ = 91911914. Its totient is φ = 91911912.

The previous prime is 91911907. The next prime is 91911917. The reversal of 91911913 is 31911919.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79780624 + 12131289 = 8932^2 + 3483^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91911913 is a prime.

It is not a weakly prime, because it can be changed into another prime (91911917) 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, 45955956 + 45955957.

It is an arithmetic number, because the mean of its divisors is an integer number (45955957).

Almost surely, 2^91911913 is an apocalyptic number.

It is an amenable number.

91911913 is a deficient number, since it is larger than the sum of its proper divisors (1).

91911913 is an equidigital number, since it uses as much as digits as its factorization.

91911913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2187, while the sum is 34.

The square root of 91911913 is about 9587.0700946640. The cubic root of 91911913 is about 451.2916192049.

The spelling of 91911913 in words is "ninety-one million, nine hundred eleven thousand, nine hundred thirteen".