91591937338 has 16 divisors (see below), whose sum is σ = 150797216736. Its totient is φ = 41377281840.

The previous prime is 91591937207. The next prime is 91591937407. The reversal of 91591937338 is 83373919519.

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, 12767181 + ... + 12774352.

It is an arithmetic number, because the mean of its divisors is an integer number (9424826046).

Almost surely, 2^91591937338 is an apocalyptic number.

91591937338 is a deficient number, since it is larger than the sum of its proper divisors (59205279398).

91591937338 is a wasteful number, since it uses less digits than its factorization.

91591937338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25541709.

The product of its digits is 5511240, while the sum is 58.

The spelling of 91591937338 in words is "ninety-one billion, five hundred ninety-one million, nine hundred thirty-seven thousand, three hundred thirty-eight".