161156 has 6 divisors (see below), whose sum is σ = 282030. Its totient is φ = 80576.

The previous prime is 161149. The next prime is 161159. The reversal of 161156 is 651161.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 160000 + 1156 = 400^2 + 34^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161156.

It is not an unprimeable number, because it can be changed into a prime (161159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20141 + ... + 20148.

It is an arithmetic number, because the mean of its divisors is an integer number (47005).

2¹⁶¹¹⁵⁶ is an apocalyptic number.

It is an amenable number.

161156 is a deficient number, since it is larger than the sum of its proper divisors (120874).

161156 is a wasteful number, since it uses less digits than its factorization.

161156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40293 (or 40291 counting only the distinct ones).

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

The square root of 161156 is about 401.4423993551. The cubic root of 161156 is about 54.4187831620.

It can be divided in two parts, 16 and 1156, that multiplied together give a square (18496 = 136²).

The spelling of 161156 in words is "one hundred sixty-one thousand, one hundred fifty-six".