91557977 has 8 divisors (see below), whose sum is σ = 106612416. Its totient is φ = 76997232.

The previous prime is 91557899. The next prime is 91558007. The reversal of 91557977 is 77975519.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91557977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91557377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123023 + ... + 123764.

It is an arithmetic number, because the mean of its divisors is an integer number (13326552).

Almost surely, 2^91557977 is an apocalyptic number.

It is an amenable number.

91557977 is a deficient number, since it is larger than the sum of its proper divisors (15054439).

91557977 is a wasteful number, since it uses less digits than its factorization.

91557977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246847.

The product of its digits is 694575, while the sum is 50.

The square root of 91557977 is about 9568.5932612898. The cubic root of 91557977 is about 450.7115934922.

The spelling of 91557977 in words is "ninety-one million, five hundred fifty-seven thousand, nine hundred seventy-seven".