161204137 has 2 divisors, whose sum is σ = 161204138. Its totient is φ = 161204136.

The previous prime is 161204089. The next prime is 161204159. The reversal of 161204137 is 731402161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130965136 + 30239001 = 11444^2 + 5499^2 .

It is a cyclic number.

It is not a de Polignac number, because 161204137 - 2²⁷ = 26986409 is a prime.

It is not a weakly prime, because it can be changed into another prime (161204237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80602068 + 80602069.

It is an arithmetic number, because the mean of its divisors is an integer number (80602069).

Almost surely, 2^161204137 is an apocalyptic number.

It is an amenable number.

161204137 is a deficient number, since it is larger than the sum of its proper divisors (1).

161204137 is an equidigital number, since it uses as much as digits as its factorization.

161204137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 161204137 is about 12696.6191169145. The cubic root of 161204137 is about 544.2420088605.

Adding to 161204137 its reverse (731402161), we get a palindrome (892606298).

The spelling of 161204137 in words is "one hundred sixty-one million, two hundred four thousand, one hundred thirty-seven".