91001515 has 8 divisors (see below), whose sum is σ = 119129328. Its totient is φ = 66182880.

The previous prime is 91001489. The next prime is 91001539. The reversal of 91001515 is 51510019.

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

It is a de Polignac number, because none of the positive numbers 2^k-91001515 is a prime.

It is a Duffinian 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, 827232 + ... + 827341.

It is an arithmetic number, because the mean of its divisors is an integer number (14891166).

Almost surely, 2^91001515 is an apocalyptic number.

91001515 is a deficient number, since it is larger than the sum of its proper divisors (28127813).

91001515 is a wasteful number, since it uses less digits than its factorization.

91001515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654589.

The product of its (nonzero) digits is 225, while the sum is 22.

The square root of 91001515 is about 9539.4714214153. The cubic root of 91001515 is about 449.7966406241.

The spelling of 91001515 in words is "ninety-one million, one thousand, five hundred fifteen".