91538986 has 32 divisors (see below), whose sum is σ = 174845952. Its totient is φ = 34902960.

The previous prime is 91538983. The next prime is 91538987. The reversal of 91538986 is 68983519.

It is not an unprimeable number, because it can be changed into a prime (91538981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 915 + ... + 13561.

It is an arithmetic number, because the mean of its divisors is an integer number (5463936).

Almost surely, 2^91538986 is an apocalyptic number.

91538986 is a deficient number, since it is larger than the sum of its proper divisors (83306966).

91538986 is a wasteful number, since it uses less digits than its factorization.

91538986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12714.

The product of its digits is 466560, while the sum is 49.

The square root of 91538986 is about 9567.6008486977. The cubic root of 91538986 is about 450.6804290650.

The spelling of 91538986 in words is "ninety-one million, five hundred thirty-eight thousand, nine hundred eighty-six".