91081315 has 32 divisors (see below), whose sum is σ = 122875200. Its totient is φ = 64350720.

The previous prime is 91081313. The next prime is 91081321. The reversal of 91081315 is 51318019.

It is not a de Polignac number, because 91081315 - 2¹ = 91081313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91081313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 397621 + ... + 397849.

It is an arithmetic number, because the mean of its divisors is an integer number (3839850).

Almost surely, 2^91081315 is an apocalyptic number.

91081315 is a deficient number, since it is larger than the sum of its proper divisors (31793885).

91081315 is a wasteful number, since it uses less digits than its factorization.

91081315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 91081315 is about 9543.6531265548. The cubic root of 91081315 is about 449.9280790409.

The spelling of 91081315 in words is "ninety-one million, eighty-one thousand, three hundred fifteen".