161599279 has 8 divisors (see below), whose sum is σ = 165026160. Its totient is φ = 158186496.

The previous prime is 161599271. The next prime is 161599303. The reversal of 161599279 is 972995161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161599279 - 2³ = 161599271 is a prime.

It is a super-2 number, since 2×161599279² = 52228653946639682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161599271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21487 + ... + 28015.

It is an arithmetic number, because the mean of its divisors is an integer number (20628270).

Almost surely, 2^161599279 is an apocalyptic number.

161599279 is a deficient number, since it is larger than the sum of its proper divisors (3426881).

161599279 is an equidigital number, since it uses as much as digits as its factorization.

161599279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7049.

The product of its digits is 306180, while the sum is 49.

The square root of 161599279 is about 12712.1705070377. The cubic root of 161599279 is about 544.6863262477.

The spelling of 161599279 in words is "one hundred sixty-one million, five hundred ninety-nine thousand, two hundred seventy-nine".