161925625 has 15 divisors (see below), whose sum is σ = 202740571. Its totient is φ = 129286000.

The previous prime is 161925623. The next prime is 161925637. The reversal of 161925625 is 526529161.

The square root of 161925625 is 12725.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 72131049 + 89794576 = 8493^2 + 9476^2 .

It is not a de Polignac number, because 161925625 - 2¹ = 161925623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161925623) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 317871 + ... + 318379.

Almost surely, 2^161925625 is an apocalyptic number.

161925625 is the 12725-th square number.

161925625 is the 6363-rd centered octagonal number.

It is an amenable number.

161925625 is a deficient number, since it is larger than the sum of its proper divisors (40814946).

161925625 is an frugal number, since it uses more digits than its factorization.

161925625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038 (or 514 counting only the distinct ones).

The product of its digits is 32400, while the sum is 37.

The cubic root of 161925625 is about 545.0527401757.

Multiplying 161925625 by its product of digits (32400), we get a square (5246390250000 = 2290500²).

The spelling of 161925625 in words is "one hundred sixty-one million, nine hundred twenty-five thousand, six hundred twenty-five".