91531145 has 16 divisors (see below), whose sum is σ = 121357440. Its totient is φ = 65919744.

The previous prime is 91531109. The next prime is 91531177. The reversal of 91531145 is 54113519.

It is not a de Polignac number, because 91531145 - 2¹⁶ = 91465609 is a prime.

It is a super-2 number, since 2×91531145² = 16755901010022050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21455 + ... + 25364.

It is an arithmetic number, because the mean of its divisors is an integer number (7584840).

Almost surely, 2^91531145 is an apocalyptic number.

It is an amenable number.

91531145 is a deficient number, since it is larger than the sum of its proper divisors (29826295).

91531145 is a wasteful number, since it uses less digits than its factorization.

91531145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46864.

The product of its digits is 2700, while the sum is 29.

The square root of 91531145 is about 9567.1910715737. The cubic root of 91531145 is about 450.6675606457.

The spelling of 91531145 in words is "ninety-one million, five hundred thirty-one thousand, one hundred forty-five".