161589964 has 12 divisors (see below), whose sum is σ = 299416824. Its totient is φ = 76042304.

The previous prime is 161589937. The next prime is 161589991. The reversal of 161589964 is 469985161.

It is an interprime number because it is at equal distance from previous prime (161589937) and next prime (161589991).

It is a super-2 number, since 2×161589964² = 52222632931042592, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1188094 + ... + 1188229.

It is an arithmetic number, because the mean of its divisors is an integer number (24951402).

Almost surely, 2^161589964 is an apocalyptic number.

It is an amenable number.

161589964 is a deficient number, since it is larger than the sum of its proper divisors (137826860).

161589964 is a wasteful number, since it uses less digits than its factorization.

161589964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376344 (or 2376342 counting only the distinct ones).

The product of its digits is 466560, while the sum is 49.

The square root of 161589964 is about 12711.8041205802. The cubic root of 161589964 is about 544.6758603376.

The spelling of 161589964 in words is "one hundred sixty-one million, five hundred eighty-nine thousand, nine hundred sixty-four".