1815125 has 16 divisors (see below), whose sum is σ = 2441712. Its totient is φ = 1339200.

The previous prime is 1815103. The next prime is 1815131. The reversal of 1815125 is 5215181.

It can be written as a sum of positive squares in 8 ways, for example, as 1423249 + 391876 = 1193^2 + 626^2 .

It is not a de Polignac number, because 1815125 - 2⁶ = 1815061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1815125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1067 + ... + 2183.

It is an arithmetic number, because the mean of its divisors is an integer number (152607).

2^1815125 is an apocalyptic number.

It is an amenable number.

1815125 is a deficient number, since it is larger than the sum of its proper divisors (626587).

1815125 is a wasteful number, since it uses less digits than its factorization.

1815125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145 (or 1135 counting only the distinct ones).

The product of its digits is 400, while the sum is 23.

The square root of 1815125 is about 1347.2657495832. The cubic root of 1815125 is about 121.9838059666.

The spelling of 1815125 in words is "one million, eight hundred fifteen thousand, one hundred twenty-five".