1813525 has 24 divisors (see below), whose sum is σ = 2640704. Its totient is φ = 1209600.

The previous prime is 1813523. The next prime is 1813547. The reversal of 1813525 is 5253181.

It is a happy number.

It is not a de Polignac number, because 1813525 - 2¹ = 1813523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

1813525 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1813525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7405 + ... + 7645.

2^1813525 is an apocalyptic number.

It is an amenable number.

1813525 is a deficient number, since it is larger than the sum of its proper divisors (827179).

1813525 is a wasteful number, since it uses less digits than its factorization.

1813525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 296 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

The square root of 1813525 is about 1346.6718234225. The cubic root of 1813525 is about 121.9479532540.

The spelling of 1813525 in words is "one million, eight hundred thirteen thousand, five hundred twenty-five".