161156133 has 6 divisors (see below), whose sum is σ = 232781094. Its totient is φ = 107437416.

The previous prime is 161156113. The next prime is 161156159. The reversal of 161156133 is 331651161.

It can be written as a sum of positive squares in only one way, i.e., 160199649 + 956484 = 12657^2 + 978^2 .

It is not a de Polignac number, because 161156133 - 2¹³ = 161147941 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161156097 and 161156106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161156113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8953110 + ... + 8953127.

It is an arithmetic number, because the mean of its divisors is an integer number (38796849).

Almost surely, 2^161156133 is an apocalyptic number.

It is an amenable number.

161156133 is a deficient number, since it is larger than the sum of its proper divisors (71624961).

161156133 is a wasteful number, since it uses less digits than its factorization.

161156133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17906243 (or 17906240 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 161156133 is about 12694.7285516469. The cubic root of 161156133 is about 544.1879813241.

The spelling of 161156133 in words is "one hundred sixty-one million, one hundred fifty-six thousand, one hundred thirty-three".