157161 has 4 divisors (see below), whose sum is σ = 209552. Its totient is φ = 104772.

The previous prime is 157141. The next prime is 157163. The reversal of 157161 is 161751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 161751 = 3 ⋅53917.

It is a de Polignac number, because none of the positive numbers 2^k-157161 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157163) 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, 26191 + ... + 26196.

It is an arithmetic number, because the mean of its divisors is an integer number (52388).

2¹⁵⁷¹⁶¹ is an apocalyptic number.

It is an amenable number.

157161 is a deficient number, since it is larger than the sum of its proper divisors (52391).

157161 is an equidigital number, since it uses as much as digits as its factorization.

157161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52390.

The product of its digits is 210, while the sum is 21.

The square root of 157161 is about 396.4353667371. The cubic root of 157161 is about 53.9653412715.

The spelling of 157161 in words is "one hundred fifty-seven thousand, one hundred sixty-one".