91914587779 has 16 divisors (see below), whose sum is σ = 107526279168. Its totient is φ = 76924455552.

The previous prime is 91914587719. The next prime is 91914587783. The reversal of 91914587779 is 97778541919.

It is not a de Polignac number, because 91914587779 - 2²¹ = 91912490627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91914587719) 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 15 ways as a sum of consecutive naturals, for example, 819294 + ... + 924700.

It is an arithmetic number, because the mean of its divisors is an integer number (6720392448).

Almost surely, 2^91914587779 is an apocalyptic number.

91914587779 is a deficient number, since it is larger than the sum of its proper divisors (15611691389).

91914587779 is a wasteful number, since it uses less digits than its factorization.

91914587779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108354.

The product of its digits is 40007520, while the sum is 67.

The spelling of 91914587779 in words is "ninety-one billion, nine hundred fourteen million, five hundred eighty-seven thousand, seven hundred seventy-nine".