161508577 has 2 divisors, whose sum is σ = 161508578. Its totient is φ = 161508576.

The previous prime is 161508499. The next prime is 161508587. The reversal of 161508577 is 775805161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127215841 + 34292736 = 11279^2 + 5856^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161508577 is a prime.

It is not a weakly prime, because it can be changed into another prime (161508587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80754288 + 80754289.

It is an arithmetic number, because the mean of its divisors is an integer number (80754289).

Almost surely, 2^161508577 is an apocalyptic number.

It is an amenable number.

161508577 is a deficient number, since it is larger than the sum of its proper divisors (1).

161508577 is an equidigital number, since it uses as much as digits as its factorization.

161508577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58800, while the sum is 40.

The square root of 161508577 is about 12708.6024802100. The cubic root of 161508577 is about 544.5844004935.

The spelling of 161508577 in words is "one hundred sixty-one million, five hundred eight thousand, five hundred seventy-seven".