161597899 has 2 divisors, whose sum is σ = 161597900. Its totient is φ = 161597898.

The previous prime is 161597893. The next prime is 161597911. The reversal of 161597899 is 998795161.

161597899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161597899 - 2⁷ = 161597771 is a prime.

It is a super-2 number, since 2×161597899² = 52227761922428402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161597893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80798949 + 80798950.

It is an arithmetic number, because the mean of its divisors is an integer number (80798950).

Almost surely, 2^161597899 is an apocalyptic number.

161597899 is a deficient number, since it is larger than the sum of its proper divisors (1).

161597899 is an equidigital number, since it uses as much as digits as its factorization.

161597899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 55.

The square root of 161597899 is about 12712.1162282289. The cubic root of 161597899 is about 544.6847757679.

The spelling of 161597899 in words is "one hundred sixty-one million, five hundred ninety-seven thousand, eight hundred ninety-nine".