91164613 has 2 divisors, whose sum is σ = 91164614. Its totient is φ = 91164612.

The previous prime is 91164581. The next prime is 91164629. The reversal of 91164613 is 31646119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72216004 + 18948609 = 8498^2 + 4353^2 .

It is an emirp because it is prime and its reverse (31646119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91164613 - 2⁵ = 91164581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91164673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45582306 + 45582307.

It is an arithmetic number, because the mean of its divisors is an integer number (45582307).

Almost surely, 2^91164613 is an apocalyptic number.

It is an amenable number.

91164613 is a deficient number, since it is larger than the sum of its proper divisors (1).

91164613 is an equidigital number, since it uses as much as digits as its factorization.

91164613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 31.

The square root of 91164613 is about 9548.0161813855. The cubic root of 91164613 is about 450.0651971380.

The spelling of 91164613 in words is "ninety-one million, one hundred sixty-four thousand, six hundred thirteen".