161599 has 2 divisors, whose sum is σ = 161600. Its totient is φ = 161598.

The previous prime is 161591. The next prime is 161611. The reversal of 161599 is 995161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161599 - 2³ = 161591 is a prime.

It is a super-2 number, since 2×161599² = 52228473602, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161599.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80799 + 80800.

It is an arithmetic number, because the mean of its divisors is an integer number (80800).

2¹⁶¹⁵⁹⁹ is an apocalyptic number.

161599 is a deficient number, since it is larger than the sum of its proper divisors (1).

161599 is an equidigital number, since it uses as much as digits as its factorization.

161599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 31.

The square root of 161599 is about 401.9937810464. The cubic root of 161599 is about 54.4686012782.

The spelling of 161599 in words is "one hundred sixty-one thousand, five hundred ninety-nine".