91279476819 has 24 divisors (see below), whose sum is σ = 135505128720. Its totient is φ = 59167412928.

The previous prime is 91279476803. The next prime is 91279476931. The reversal of 91279476819 is 91867497219.

91279476819 is a `hidden beast` number, since 9 + 12 + 79 + 476 + 81 + 9 = 666.

It is not a de Polignac number, because 91279476819 - 2⁴ = 91279476803 is a prime.

It is a super-2 number, since 2×91279476819² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91279476419) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 391909 + ... + 579785.

It is an arithmetic number, because the mean of its divisors is an integer number (5646047030).

Almost surely, 2^91279476819 is an apocalyptic number.

91279476819 is a deficient number, since it is larger than the sum of its proper divisors (44225651901).

91279476819 is a wasteful number, since it uses less digits than its factorization.

91279476819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189379 (or 189376 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The spelling of 91279476819 in words is "ninety-one billion, two hundred seventy-nine million, four hundred seventy-six thousand, eight hundred nineteen".