91688834251 has 12 divisors (see below), whose sum is σ = 107655253848. Its totient is φ = 77855934912.

The previous prime is 91688834243. The next prime is 91688834257. The reversal of 91688834251 is 15243888619.

It is a happy number.

It is not a de Polignac number, because 91688834251 - 2³ = 91688834243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91688834192 and 91688834201.

It is not an unprimeable number, because it can be changed into a prime (91688834257) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 8738686 + ... + 8749171.

It is an arithmetic number, because the mean of its divisors is an integer number (8971271154).

Almost surely, 2^91688834251 is an apocalyptic number.

91688834251 is a deficient number, since it is larger than the sum of its proper divisors (15966419597).

91688834251 is a wasteful number, since it uses less digits than its factorization.

91688834251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17487978 (or 17487971 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 55.

The spelling of 91688834251 in words is "ninety-one billion, six hundred eighty-eight million, eight hundred thirty-four thousand, two hundred fifty-one".