161319872 has 28 divisors (see below), whose sum is σ = 365851440. Its totient is φ = 69136896.

The previous prime is 161319869. The next prime is 161319883. The reversal of 161319872 is 278913161.

It is a tau number, because it is divible by the number of its divisors (28).

It is a super-2 number, since 2×161319872² = 52048202204192768, which contains 22 as substring.

It is a congruent number.

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, 179597 + ... + 180492.

Almost surely, 2^161319872 is an apocalyptic number.

It is an amenable number.

161319872 is an abundant number, since it is smaller than the sum of its proper divisors (204531568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161319872 is an equidigital number, since it uses as much as digits as its factorization.

161319872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360108 (or 360098 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 161319872 is about 12701.1760085435. The cubic root of 161319872 is about 544.3722221875.

The spelling of 161319872 in words is "one hundred sixty-one million, three hundred nineteen thousand, eight hundred seventy-two".