91323135788 has 24 divisors (see below), whose sum is σ = 169285025952. Its totient is φ = 42958164224.

The previous prime is 91323135767. The next prime is 91323135793. The reversal of 91323135788 is 88753132319.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102656 + ... + 439527.

It is an arithmetic number, because the mean of its divisors is an integer number (7053542748).

Almost surely, 2^91323135788 is an apocalyptic number.

It is an amenable number.

91323135788 is a deficient number, since it is larger than the sum of its proper divisors (77961890164).

91323135788 is a wasteful number, since it uses less digits than its factorization.

91323135788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544681 (or 544679 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 50.

The spelling of 91323135788 in words is "ninety-one billion, three hundred twenty-three million, one hundred thirty-five thousand, seven hundred eighty-eight".