156161 has 4 divisors (see below), whose sum is σ = 164400. Its totient is φ = 147924.

The previous prime is 156157. The next prime is 156217. The reversal of 156161 is 161651.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 156161 - 2² = 156157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4091 + ... + 4128.

It is an arithmetic number, because the mean of its divisors is an integer number (41100).

It is a Proth number, since it is equal to 305 ⋅ 2⁹ + 1 and 305 < 2⁹.

2¹⁵⁶¹⁶¹ is an apocalyptic number.

It is an amenable number.

156161 is a deficient number, since it is larger than the sum of its proper divisors (8239).

156161 is an equidigital number, since it uses as much as digits as its factorization.

156161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8238.

The product of its digits is 180, while the sum is 20.

The square root of 156161 is about 395.1721144008. The cubic root of 156161 is about 53.8506389252.

The spelling of 156161 in words is "one hundred fifty-six thousand, one hundred sixty-one".