161927279 has 4 divisors (see below), whose sum is σ = 162115776. Its totient is φ = 161738784.

The previous prime is 161927263. The next prime is 161927299. The reversal of 161927279 is 972729161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 972729161 = 73 ⋅13325057.

It is a cyclic number.

It is not a de Polignac number, because 161927279 - 2⁴ = 161927263 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 (161927209) 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, 92954 + ... + 94679.

It is an arithmetic number, because the mean of its divisors is an integer number (40528944).

Almost surely, 2^161927279 is an apocalyptic number.

161927279 is a deficient number, since it is larger than the sum of its proper divisors (188497).

161927279 is an equidigital number, since it uses as much as digits as its factorization.

161927279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188496.

The product of its digits is 95256, while the sum is 44.

The square root of 161927279 is about 12725.0649900109. The cubic root of 161927279 is about 545.0545959951.

The spelling of 161927279 in words is "one hundred sixty-one million, nine hundred twenty-seven thousand, two hundred seventy-nine".