79131171842 has 42 divisors (see below), whose sum is σ = 129760380633. Its totient is φ = 36190662984.

The previous prime is 79131171829. The next prime is 79131171949. The reversal of 79131171842 is 24817113197.

It can be written as a sum of positive squares in 2 ways, for example, as 79084125961 + 47045881 = 281219^2 + 6859^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=198911.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79131171793 and 79131171802.

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 2728661084 + ... + 2728661112.

Almost surely, 2^79131171842 is an apocalyptic number.

79131171842 is a deficient number, since it is larger than the sum of its proper divisors (50629208791).

79131171842 is an frugal number, since it uses more digits than its factorization.

79131171842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 50 counting only the distinct ones).

The product of its digits is 84672, while the sum is 44.

The spelling of 79131171842 in words is "seventy-nine billion, one hundred thirty-one million, one hundred seventy-one thousand, eight hundred forty-two".