161312159 has 4 divisors (see below), whose sum is σ = 161392416. Its totient is φ = 161231904.

The previous prime is 161312149. The next prime is 161312171. The reversal of 161312159 is 951213161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 951213161 = 41 ⋅23200321.

It is a cyclic number.

It is not a de Polignac number, because 161312159 - 2⁴ = 161312143 is a prime.

It is a super-2 number, since 2×161312159² = 52043225282482562, 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 (161312149) 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, 37034 + ... + 41159.

It is an arithmetic number, because the mean of its divisors is an integer number (40348104).

Almost surely, 2^161312159 is an apocalyptic number.

161312159 is a deficient number, since it is larger than the sum of its proper divisors (80257).

161312159 is an equidigital number, since it uses as much as digits as its factorization.

161312159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80256.

The product of its digits is 1620, while the sum is 29.

The square root of 161312159 is about 12700.8723716129. The cubic root of 161312159 is about 544.3635462366.

The spelling of 161312159 in words is "one hundred sixty-one million, three hundred twelve thousand, one hundred fifty-nine".