91382438505 has 32 divisors (see below), whose sum is σ = 148336110720. Its totient is φ = 48032110080.

The previous prime is 91382438489. The next prime is 91382438573. The reversal of 91382438505 is 50583428319.

It is not a de Polignac number, because 91382438505 - 2⁴ = 91382438489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 419475 + ... + 598935.

It is an arithmetic number, because the mean of its divisors is an integer number (4635503460).

Almost surely, 2^91382438505 is an apocalyptic number.

It is an amenable number.

91382438505 is a deficient number, since it is larger than the sum of its proper divisors (56953672215).

91382438505 is a wasteful number, since it uses less digits than its factorization.

91382438505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179961.

The product of its (nonzero) digits is 1036800, while the sum is 48.

The spelling of 91382438505 in words is "ninety-one billion, three hundred eighty-two million, four hundred thirty-eight thousand, five hundred five".