91908136323 has 8 divisors (see below), whose sum is σ = 136160202000. Its totient is φ = 61272090864.

The previous prime is 91908136319. The next prime is 91908136339. The reversal of 91908136323 is 32363180919.

91908136323 is a `hidden beast` number, since 9 + 1 + 9 + 0 + 8 + 1 + 3 + 632 + 3 = 666.

It is not a de Polignac number, because 91908136323 - 2² = 91908136319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91908136363) 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 7 ways as a sum of consecutive naturals, for example, 1702002498 + ... + 1702002551.

It is an arithmetic number, because the mean of its divisors is an integer number (17020025250).

Almost surely, 2^91908136323 is an apocalyptic number.

91908136323 is a deficient number, since it is larger than the sum of its proper divisors (44252065677).

91908136323 is a wasteful number, since it uses less digits than its factorization.

91908136323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3404005058 (or 3404005052 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 91908136323 in words is "ninety-one billion, nine hundred eight million, one hundred thirty-six thousand, three hundred twenty-three".