91689752499 has 4 divisors (see below), whose sum is σ = 122253003336. Its totient is φ = 61126501664.

The previous prime is 91689752461. The next prime is 91689752519. The reversal of 91689752499 is 99425798619.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91689752499 - 2⁸ = 91689752243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91689752449) 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 3 ways as a sum of consecutive naturals, for example, 15281625414 + ... + 15281625419.

It is an arithmetic number, because the mean of its divisors is an integer number (30563250834).

Almost surely, 2^91689752499 is an apocalyptic number.

91689752499 is a deficient number, since it is larger than the sum of its proper divisors (30563250837).

91689752499 is a wasteful number, since it uses less digits than its factorization.

91689752499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30563250836.

The product of its digits is 88179840, while the sum is 69.

The spelling of 91689752499 in words is "ninety-one billion, six hundred eighty-nine million, seven hundred fifty-two thousand, four hundred ninety-nine".