161589609 has 12 divisors (see below), whose sum is σ = 233614836. Its totient is φ = 107630592.

The previous prime is 161589601. The next prime is 161589611. The reversal of 161589609 is 906985161.

161589609 is a `hidden beast` number, since 1 + 6 + 1 + 589 + 60 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 66585600 + 95004009 = 8160^2 + 9747^2 .

It is not a de Polignac number, because 161589609 - 2³ = 161589601 is a prime.

It is a super-2 number, since 2×161589609² = 52222403473545762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161589601) 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 in 11 ways as a sum of consecutive naturals, for example, 3577 + ... + 18329.

It is an arithmetic number, because the mean of its divisors is an integer number (19467903).

Almost surely, 2^161589609 is an apocalyptic number.

It is an amenable number.

161589609 is a deficient number, since it is larger than the sum of its proper divisors (72025227).

161589609 is a wasteful number, since it uses less digits than its factorization.

161589609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15976 (or 15973 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 161589609 is about 12711.7901571730. The cubic root of 161589609 is about 544.6754614678.

The spelling of 161589609 in words is "one hundred sixty-one million, five hundred eighty-nine thousand, six hundred nine".