91377613 has 2 divisors, whose sum is σ = 91377614. Its totient is φ = 91377612.

The previous prime is 91377571. The next prime is 91377653. The reversal of 91377613 is 31677319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57714409 + 33663204 = 7597^2 + 5802^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91377613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91377653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45688806 + 45688807.

It is an arithmetic number, because the mean of its divisors is an integer number (45688807).

Almost surely, 2^91377613 is an apocalyptic number.

It is an amenable number.

91377613 is a deficient number, since it is larger than the sum of its proper divisors (1).

91377613 is an equidigital number, since it uses as much as digits as its factorization.

91377613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 37.

The square root of 91377613 is about 9559.1638232640. The cubic root of 91377613 is about 450.4154402157.

The spelling of 91377613 in words is "ninety-one million, three hundred seventy-seven thousand, six hundred thirteen".