91121882018 has 32 divisors (see below), whose sum is σ = 139345920000. Its totient is φ = 44683352784.

The previous prime is 91121881999. The next prime is 91121882023. The reversal of 91121882018 is 81028812119.

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, 13558463 + ... + 13565181.

It is an arithmetic number, because the mean of its divisors is an integer number (4354560000).

Almost surely, 2^91121882018 is an apocalyptic number.

91121882018 is a deficient number, since it is larger than the sum of its proper divisors (48224037982).

91121882018 is a wasteful number, since it uses less digits than its factorization.

91121882018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7454.

The product of its (nonzero) digits is 18432, while the sum is 41.

The spelling of 91121882018 in words is "ninety-one billion, one hundred twenty-one million, eight hundred eighty-two thousand, eighteen".