8181625 has 32 divisors (see below), whose sum is σ = 11026080. Its totient is φ = 6048000.

The previous prime is 8181623. The next prime is 8181631. The reversal of 8181625 is 5261818.

It can be written as a sum of positive squares in 16 ways, for example, as 6230016 + 1951609 = 2496^2 + 1397^2 .

It is not a de Polignac number, because 8181625 - 2¹ = 8181623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8181623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134095 + ... + 134155.

It is an arithmetic number, because the mean of its divisors is an integer number (344565).

Almost surely, 2^8181625 is an apocalyptic number.

It is an amenable number.

8181625 is a deficient number, since it is larger than the sum of its proper divisors (2844455).

8181625 is a wasteful number, since it uses less digits than its factorization.

8181625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 132 counting only the distinct ones).

The product of its digits is 3840, while the sum is 31.

The square root of 8181625 is about 2860.3539990707. The cubic root of 8181625 is about 201.5022299421.

The spelling of 8181625 in words is "eight million, one hundred eighty-one thousand, six hundred twenty-five".