91485531 has 20 divisors (see below), whose sum is σ = 136923600. Its totient is φ = 60874416.

The previous prime is 91485521. The next prime is 91485587. The reversal of 91485531 is 13558419.

It is not a de Polignac number, because 91485531 - 2¹⁰ = 91484507 is a prime.

It is a super-2 number, since 2×91485531² = 16739204764703922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

91485531 is a Rhonda number in base 10.

Its product of digits (21600) is a multiple of the sum of its prime factors (2160).

It is not an unprimeable number, because it can be changed into a prime (91485521) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 73825 + ... + 75053.

It is an arithmetic number, because the mean of its divisors is an integer number (6846180).

Almost surely, 2^91485531 is an apocalyptic number.

91485531 is a deficient number, since it is larger than the sum of its proper divisors (45438069).

91485531 is a wasteful number, since it uses less digits than its factorization.

91485531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160 (or 2151 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 91485531 is about 9564.8068982076. The cubic root of 91485531 is about 450.5926857098.

The spelling of 91485531 in words is "ninety-one million, four hundred eighty-five thousand, five hundred thirty-one".