91215618054 has 32 divisors (see below), whose sum is σ = 199178797824. Its totient is φ = 27618470880.

The previous prime is 91215618029. The next prime is 91215618059. The reversal of 91215618054 is 45081651219.

It is a junction number, because it is equal to n+sod(n) for n = 91215617997 and 91215618015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91215618059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 484309 + ... + 645744.

It is an arithmetic number, because the mean of its divisors is an integer number (6224337432).

Almost surely, 2^91215618054 is an apocalyptic number.

91215618054 is an abundant number, since it is smaller than the sum of its proper divisors (107963179770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91215618054 is a wasteful number, since it uses less digits than its factorization.

91215618054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131292.

The product of its (nonzero) digits is 86400, while the sum is 42.

The spelling of 91215618054 in words is "ninety-one billion, two hundred fifteen million, six hundred eighteen thousand, fifty-four".