91061915 has 12 divisors (see below), whose sum is σ = 124962384. Its totient is φ = 62403744.

The previous prime is 91061881. The next prime is 91061923. The reversal of 91061915 is 51916019.

It is a happy number.

It is not a de Polignac number, because 91061915 - 2¹⁴ = 91045531 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55649 + ... + 57261.

It is an arithmetic number, because the mean of its divisors is an integer number (10413532).

Almost surely, 2^91061915 is an apocalyptic number.

91061915 is a deficient number, since it is larger than the sum of its proper divisors (33900469).

91061915 is an frugal number, since it uses more digits than its factorization.

91061915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238 (or 1625 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 91061915 is about 9542.6366901397. The cubic root of 91061915 is about 449.8961324061.

The spelling of 91061915 in words is "ninety-one million, sixty-one thousand, nine hundred fifteen".