91513915 has 8 divisors (see below), whose sum is σ = 110301840. Its totient is φ = 72887712.

The previous prime is 91513909. The next prime is 91513949. The reversal of 91513915 is 51931519.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91513915 - 2¹⁷ = 91382843 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39180 + ... + 41449.

It is an arithmetic number, because the mean of its divisors is an integer number (13787730).

Almost surely, 2^91513915 is an apocalyptic number.

91513915 is a deficient number, since it is larger than the sum of its proper divisors (18787925).

91513915 is a wasteful number, since it uses less digits than its factorization.

91513915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80861.

The product of its digits is 6075, while the sum is 34.

The square root of 91513915 is about 9566.2905559051. The cubic root of 91513915 is about 450.6392806930.

The spelling of 91513915 in words is "ninety-one million, five hundred thirteen thousand, nine hundred fifteen".