91879849715 has 4 divisors (see below), whose sum is σ = 110255819664. Its totient is φ = 73503879768.

The previous prime is 91879849673. The next prime is 91879849717. The reversal of 91879849715 is 51794897819.

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 91879849715 - 2²⁸ = 91611414259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91879849717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9187984967 + ... + 9187984976.

It is an arithmetic number, because the mean of its divisors is an integer number (27563954916).

Almost surely, 2^91879849715 is an apocalyptic number.

91879849715 is a deficient number, since it is larger than the sum of its proper divisors (18375969949).

91879849715 is a wasteful number, since it uses less digits than its factorization.

91879849715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18375969948.

The product of its digits is 45722880, while the sum is 68.

The spelling of 91879849715 in words is "ninety-one billion, eight hundred seventy-nine million, eight hundred forty-nine thousand, seven hundred fifteen".