172081925 has 12 divisors (see below), whose sum is σ = 213547716. Its totient is φ = 137558400.

The previous prime is 172081913. The next prime is 172081957. The reversal of 172081925 is 529180271.

It is a Cunningham number, because it is equal to 13118²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 13498276 + 158583649 = 3674^2 + 12593^2 .

It is not a de Polignac number, because 172081925 - 2⁴ = 172081909 is a prime.

It is a super-2 number, since 2×172081925² = 59224377823411250, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 51815 + ... + 55035.

It is an arithmetic number, because the mean of its divisors is an integer number (17795643).

Almost surely, 2^172081925 is an apocalyptic number.

It is an amenable number.

172081925 is a deficient number, since it is larger than the sum of its proper divisors (41465791).

172081925 is a wasteful number, since it uses less digits than its factorization.

172081925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5368 (or 5363 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 172081925 is about 13118.0000381156. Note that the first 4 decimals coincide. The cubic root of 172081925 is about 556.2180590168.

The spelling of 172081925 in words is "one hundred seventy-two million, eighty-one thousand, nine hundred twenty-five".