2172081925 has 24 divisors (see below), whose sum is σ = 3071194056. Its totient is φ = 1509642240.

The previous prime is 2172081907. The next prime is 2172081937. The reversal of 2172081925 is 5291802712.

It can be written as a sum of positive squares in 12 ways, for example, as 815559364 + 1356522561 = 28558^2 + 36831^2 .

It is not a de Polignac number, because 2172081925 - 2⁵ = 2172081893 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 23 ways as a sum of consecutive naturals, for example, 191044 + ... + 202093.

It is an arithmetic number, because the mean of its divisors is an integer number (127966419).

Almost surely, 2^2172081925 is an apocalyptic number.

2172081925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2172081925 is a deficient number, since it is larger than the sum of its proper divisors (899112131).

2172081925 is a wasteful number, since it uses less digits than its factorization.

2172081925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393177 (or 393172 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 2172081925 is about 46605.5997172014. The cubic root of 2172081925 is about 1295.0664933086.

The spelling of 2172081925 in words is "two billion, one hundred seventy-two million, eighty-one thousand, nine hundred twenty-five".