161889325 has 18 divisors (see below), whose sum is σ = 217378014. Its totient is φ = 119545920.

The previous prime is 161889293. The next prime is 161889331. The reversal of 161889325 is 523988161.

161889325 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 9 ways, for example, as 91278916 + 70610409 = 9554^2 + 8403^2 .

It is not a de Polignac number, because 161889325 - 2⁵ = 161889293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 14934 + ... + 23383.

Almost surely, 2^161889325 is an apocalyptic number.

It is an amenable number.

161889325 is a deficient number, since it is larger than the sum of its proper divisors (55488689).

161889325 is a wasteful number, since it uses less digits than its factorization.

161889325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38353 (or 38335 counting only the distinct ones).

The product of its digits is 103680, while the sum is 43.

The square root of 161889325 is about 12723.5735939240. The cubic root of 161889325 is about 545.0120077033.

It can be divided in two parts, 16 and 1889325, that multiplied together give a triangular number (30229200 = T₇₇₇₅).

The spelling of 161889325 in words is "one hundred sixty-one million, eight hundred eighty-nine thousand, three hundred twenty-five".