91310196879 has 24 divisors (see below), whose sum is σ = 143902761600. Its totient is φ = 55331810640.

The previous prime is 91310196877. The next prime is 91310196907. The reversal of 91310196879 is 97869101319.

It is a happy number.

It is not a de Polignac number, because 91310196879 - 2¹ = 91310196877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91310196871) 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, 695892 + ... + 816630.

It is an arithmetic number, because the mean of its divisors is an integer number (5995948400).

Almost surely, 2^91310196879 is an apocalyptic number.

91310196879 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

91310196879 is a deficient number, since it is larger than the sum of its proper divisors (52592564721).

91310196879 is a wasteful number, since it uses less digits than its factorization.

91310196879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128395 (or 128392 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 54.

The spelling of 91310196879 in words is "ninety-one billion, three hundred ten million, one hundred ninety-six thousand, eight hundred seventy-nine".