91662913 has 2 divisors, whose sum is σ = 91662914. Its totient is φ = 91662912.

The previous prime is 91662911. The next prime is 91662919. The reversal of 91662913 is 31926619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91527489 + 135424 = 9567^2 + 368^2 .

It is a cyclic number.

It is not a de Polignac number, because 91662913 - 2¹ = 91662911 is a prime.

Together with 91662911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91662911) 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, 45831456 + 45831457.

It is an arithmetic number, because the mean of its divisors is an integer number (45831457).

Almost surely, 2^91662913 is an apocalyptic number.

It is an amenable number.

91662913 is a deficient number, since it is larger than the sum of its proper divisors (1).

91662913 is an equidigital number, since it uses as much as digits as its factorization.

91662913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 37.

The square root of 91662913 is about 9574.0750467082. The cubic root of 91662913 is about 450.8837169051.

The spelling of 91662913 in words is "ninety-one million, six hundred sixty-two thousand, nine hundred thirteen".