91361838815 has 16 divisors (see below), whose sum is σ = 122138906400. Its totient is φ = 65140747392.

The previous prime is 91361838809. The next prime is 91361838823. The reversal of 91361838815 is 51883816319.

It is a cyclic number.

It is not a de Polignac number, because 91361838815 - 2¹² = 91361834719 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24232025 + ... + 24235794.

It is an arithmetic number, because the mean of its divisors is an integer number (7633681650).

Almost surely, 2^91361838815 is an apocalyptic number.

91361838815 is a deficient number, since it is larger than the sum of its proper divisors (30777067585).

91361838815 is a wasteful number, since it uses less digits than its factorization.

91361838815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48467866.

The product of its digits is 1244160, while the sum is 53.

The spelling of 91361838815 in words is "ninety-one billion, three hundred sixty-one million, eight hundred thirty-eight thousand, eight hundred fifteen".