79175942891 has 4 divisors (see below), whose sum is σ = 83343097800. Its totient is φ = 75008787984.

The previous prime is 79175942887. The next prime is 79175942917. The reversal of 79175942891 is 19824957197.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19824957197 = 487 ⋅40708331.

It is a cyclic number.

It is not a de Polignac number, because 79175942891 - 2² = 79175942887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79175942821) 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 3 ways as a sum of consecutive naturals, for example, 2083577426 + ... + 2083577463.

It is an arithmetic number, because the mean of its divisors is an integer number (20835774450).

Almost surely, 2^79175942891 is an apocalyptic number.

79175942891 is a deficient number, since it is larger than the sum of its proper divisors (4167154909).

79175942891 is a wasteful number, since it uses less digits than its factorization.

79175942891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4167154908.

The product of its digits is 11430720, while the sum is 62.

The spelling of 79175942891 in words is "seventy-nine billion, one hundred seventy-five million, nine hundred forty-two thousand, eight hundred ninety-one".