91285977 has 8 divisors (see below), whose sum is σ = 122603616. Its totient is φ = 60412832.

The previous prime is 91285969. The next prime is 91286009. The reversal of 91285977 is 77958219.

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

It is a cyclic number.

It is not a de Polignac number, because 91285977 - 2³ = 91285969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91285277) 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, 110643 + ... + 111464.

It is an arithmetic number, because the mean of its divisors is an integer number (15325452).

Almost surely, 2^91285977 is an apocalyptic number.

It is an amenable number.

91285977 is a deficient number, since it is larger than the sum of its proper divisors (31317639).

91285977 is a wasteful number, since it uses less digits than its factorization.

91285977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222247.

The product of its digits is 317520, while the sum is 48.

The square root of 91285977 is about 9554.3695239403. The cubic root of 91285977 is about 450.2648268338.

The spelling of 91285977 in words is "ninety-one million, two hundred eighty-five thousand, nine hundred seventy-seven".