161620925 has 12 divisors (see below), whose sum is σ = 201573780. Its totient is φ = 128545920.

The previous prime is 161620919. The next prime is 161620933. The reversal of 161620925 is 529026161.

It is a happy number.

161620925 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 6 ways, for example, as 10355524 + 151265401 = 3218^2 + 12299^2 .

It is not a de Polignac number, because 161620925 - 2⁴ = 161620909 is a prime.

It is a super-2 number, since 2×161620925² = 52242646795711250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161620891 and 161620900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14360 + ... + 23009.

It is an arithmetic number, because the mean of its divisors is an integer number (16797815).

Almost surely, 2^161620925 is an apocalyptic number.

It is an amenable number.

161620925 is a deficient number, since it is larger than the sum of its proper divisors (39952855).

161620925 is a wasteful number, since it uses less digits than its factorization.

161620925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37552 (or 37547 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 161620925 is about 12713.0218673610. The cubic root of 161620925 is about 544.7106451554.

The spelling of 161620925 in words is "one hundred sixty-one million, six hundred twenty thousand, nine hundred twenty-five".