91000015 has 8 divisors (see below), whose sum is σ = 109257840. Its totient is φ = 72761472.

The previous prime is 91000009. The next prime is 91000027. The reversal of 91000015 is 51000019.

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 91000015 - 2²³ = 82611407 is a prime.

It is a congruent number.

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, 9367 + ... + 16423.

It is an arithmetic number, because the mean of its divisors is an integer number (13657230).

Almost surely, 2^91000015 is an apocalyptic number.

91000015 is a deficient number, since it is larger than the sum of its proper divisors (18257825).

91000015 is a wasteful number, since it uses less digits than its factorization.

91000015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9641.

The product of its (nonzero) digits is 45, while the sum is 16.

The square root of 91000015 is about 9539.3928003831. The cubic root of 91000015 is about 449.7941692415.

The spelling of 91000015 in words is "ninety-one million, fifteen", and thus it is an aban number and an uban number.