91379617 has 4 divisors (see below), whose sum is σ = 104433856. Its totient is φ = 78325380.

The previous prime is 91379591. The next prime is 91379623. The reversal of 91379617 is 71697319.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71697319 = 79 ⋅907561.

It is not a de Polignac number, because 91379617 - 2⁷ = 91379489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91379657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6527109 + ... + 6527122.

It is an arithmetic number, because the mean of its divisors is an integer number (26108464).

Almost surely, 2^91379617 is an apocalyptic number.

It is an amenable number.

91379617 is a deficient number, since it is larger than the sum of its proper divisors (13054239).

91379617 is a wasteful number, since it uses less digits than its factorization.

91379617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13054238.

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

The square root of 91379617 is about 9559.2686435731. The cubic root of 91379617 is about 450.4187328746.

The spelling of 91379617 in words is "ninety-one million, three hundred seventy-nine thousand, six hundred seventeen".