91377691 has 2 divisors, whose sum is σ = 91377692. Its totient is φ = 91377690.

The previous prime is 91377683. The next prime is 91377733. The reversal of 91377691 is 19677319.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91377691 - 2³ = 91377683 is a prime.

It is not a weakly prime, because it can be changed into another prime (91377661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45688845 + 45688846.

It is an arithmetic number, because the mean of its divisors is an integer number (45688846).

Almost surely, 2^91377691 is an apocalyptic number.

91377691 is a deficient number, since it is larger than the sum of its proper divisors (1).

91377691 is an equidigital number, since it uses as much as digits as its factorization.

91377691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 43.

The square root of 91377691 is about 9559.1679031179. The cubic root of 91377691 is about 450.4155683740.

The spelling of 91377691 in words is "ninety-one million, three hundred seventy-seven thousand, six hundred ninety-one".