161599577 has 2 divisors, whose sum is σ = 161599578. Its totient is φ = 161599576.

The previous prime is 161599549. The next prime is 161599591. The reversal of 161599577 is 775995161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150283081 + 11316496 = 12259^2 + 3364^2 .

It is a cyclic number.

It is not a de Polignac number, because 161599577 - 2¹² = 161595481 is a prime.

It is a super-2 number, since 2×161599577² = 52228846573157858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161599507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80799788 + 80799789.

It is an arithmetic number, because the mean of its divisors is an integer number (80799789).

Almost surely, 2^161599577 is an apocalyptic number.

It is an amenable number.

161599577 is a deficient number, since it is larger than the sum of its proper divisors (1).

161599577 is an equidigital number, since it uses as much as digits as its factorization.

161599577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 595350, while the sum is 50.

The square root of 161599577 is about 12712.1822280834. The cubic root of 161599577 is about 544.6866610604.

The spelling of 161599577 in words is "one hundred sixty-one million, five hundred ninety-nine thousand, five hundred seventy-seven".