18525413 has 4 divisors (see below), whose sum is σ = 18606540. Its totient is φ = 18444288.

The previous prime is 18525407. The next prime is 18525431. The reversal of 18525413 is 31452581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17032129 + 1493284 = 4127^2 + 1222^2 .

It is a cyclic number.

It is not a de Polignac number, because 18525413 - 2⁶ = 18525349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18525443) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 40220 + ... + 40677.

It is an arithmetic number, because the mean of its divisors is an integer number (4651635).

Almost surely, 2^18525413 is an apocalyptic number.

It is an amenable number.

18525413 is a deficient number, since it is larger than the sum of its proper divisors (81127).

18525413 is an equidigital number, since it uses as much as digits as its factorization.

18525413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81126.

The product of its digits is 4800, while the sum is 29.

The square root of 18525413 is about 4304.1158209323. The cubic root of 18525413 is about 264.5996708424.

Adding to 18525413 its reverse (31452581), we get a palindrome (49977994).

The spelling of 18525413 in words is "eighteen million, five hundred twenty-five thousand, four hundred thirteen".