91361815 has 8 divisors (see below), whose sum is σ = 110043360. Its totient is φ = 72816672.

The previous prime is 91361807. The next prime is 91361821. The reversal of 91361815 is 51816319.

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 91361815 - 2³ = 91361807 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, 32619 + ... + 35308.

It is an arithmetic number, because the mean of its divisors is an integer number (13755420).

Almost surely, 2^91361815 is an apocalyptic number.

91361815 is a deficient number, since it is larger than the sum of its proper divisors (18681545).

91361815 is a wasteful number, since it uses less digits than its factorization.

91361815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68201.

The product of its digits is 6480, while the sum is 34.

The square root of 91361815 is about 9558.3374600398. The cubic root of 91361815 is about 450.3894817305.

The spelling of 91361815 in words is "ninety-one million, three hundred sixty-one thousand, eight hundred fifteen".