8181925 has 6 divisors (see below), whose sum is σ = 10145618. Its totient is φ = 6545520.

The previous prime is 8181917. The next prime is 8181931. The reversal of 8181925 is 5291818.

It can be written as a sum of positive squares in 3 ways, for example, as 772641 + 7409284 = 879^2 + 2722^2 .

It is not a de Polignac number, because 8181925 - 2³ = 8181917 is a prime.

It is a Duffinian number.

8181925 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 163614 + ... + 163663.

Almost surely, 2^8181925 is an apocalyptic number.

It is an amenable number.

8181925 is a deficient number, since it is larger than the sum of its proper divisors (1963693).

8181925 is a wasteful number, since it uses less digits than its factorization.

8181925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327287 (or 327282 counting only the distinct ones).

The product of its digits is 5760, while the sum is 34.

The square root of 8181925 is about 2860.4064396515. The cubic root of 8181925 is about 201.5046927751.

The spelling of 8181925 in words is "eight million, one hundred eighty-one thousand, nine hundred twenty-five".