161575137 has 24 divisors (see below), whose sum is σ = 240687720. Its totient is φ = 104382720.

The previous prime is 161575133. The next prime is 161575147. The reversal of 161575137 is 731575161.

161575137 is a `hidden beast` number, since 1 + 615 + 7 + 5 + 1 + 37 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 767376 + 160807761 = 876^2 + 12681^2 .

It is not a de Polignac number, because 161575137 - 2² = 161575133 is a prime.

It is a super-2 number, since 2×161575137² = 52213049793137538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161575133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56539 + ... + 59327.

It is an arithmetic number, because the mean of its divisors is an integer number (10028655).

Almost surely, 2^161575137 is an apocalyptic number.

It is an amenable number.

161575137 is a deficient number, since it is larger than the sum of its proper divisors (79112583).

161575137 is a wasteful number, since it uses less digits than its factorization.

161575137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2993 (or 2990 counting only the distinct ones).

The product of its digits is 22050, while the sum is 36.

The square root of 161575137 is about 12711.2209091023. The cubic root of 161575137 is about 544.6592005653.

The spelling of 161575137 in words is "one hundred sixty-one million, five hundred seventy-five thousand, one hundred thirty-seven".