161979079 has 4 divisors (see below), whose sum is σ = 162120960. Its totient is φ = 161837200.

The previous prime is 161979071. The next prime is 161979089. The reversal of 161979079 is 970979161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 970979161 = 15767 ⋅61583.

It is a cyclic number.

It is not a de Polignac number, because 161979079 - 2³ = 161979071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161979071) 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, 69214 + ... + 71515.

It is an arithmetic number, because the mean of its divisors is an integer number (40530240).

Almost surely, 2^161979079 is an apocalyptic number.

161979079 is a deficient number, since it is larger than the sum of its proper divisors (141881).

161979079 is a wasteful number, since it uses less digits than its factorization.

161979079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141880.

The product of its (nonzero) digits is 214326, while the sum is 49.

The square root of 161979079 is about 12727.1001803239. The cubic root of 161979079 is about 545.1127101851.

The spelling of 161979079 in words is "one hundred sixty-one million, nine hundred seventy-nine thousand, seventy-nine".