91809677 has 4 divisors (see below), whose sum is σ = 91829760. Its totient is φ = 91789596.

The previous prime is 91809671. The next prime is 91809709. The reversal of 91809677 is 77690819.

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.

It is a cyclic number.

It is not a de Polignac number, because 91809677 - 2²⁰ = 90761101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91809671) 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, 518 + ... + 13560.

It is an arithmetic number, because the mean of its divisors is an integer number (22957440).

Almost surely, 2^91809677 is an apocalyptic number.

It is an amenable number.

91809677 is a deficient number, since it is larger than the sum of its proper divisors (20083).

91809677 is a wasteful number, since it uses less digits than its factorization.

91809677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20082.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 91809677 is about 9581.7366380004. The cubic root of 91809677 is about 451.1242293423.

The spelling of 91809677 in words is "ninety-one million, eight hundred nine thousand, six hundred seventy-seven".