79519961491 has 4 divisors (see below), whose sum is σ = 79541615032. Its totient is φ = 79498307952.

The previous prime is 79519961471. The next prime is 79519961501. The reversal of 79519961491 is 19416991597.

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 79519961491 - 2¹⁵ = 79519928723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79519961401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10821261 + ... + 10828606.

It is an arithmetic number, because the mean of its divisors is an integer number (19885403758).

Almost surely, 2^79519961491 is an apocalyptic number.

79519961491 is a deficient number, since it is larger than the sum of its proper divisors (21653541).

79519961491 is a wasteful number, since it uses less digits than its factorization.

79519961491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21653540.

The product of its digits is 5511240, while the sum is 61.

The spelling of 79519961491 in words is "seventy-nine billion, five hundred nineteen million, nine hundred sixty-one thousand, four hundred ninety-one".