18513025 has 6 divisors (see below), whose sum is σ = 22956182. Its totient is φ = 14810400.

The previous prime is 18513023. The next prime is 18513029. The reversal of 18513025 is 52031581.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2005056 + 16507969 = 1416^2 + 4063^2 .

It is not a de Polignac number, because 18513025 - 2¹ = 18513023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 740521 = 18513025 / (1 + 8 + 5 + 1 + 3 + 0 + 2 + 5).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18513023) 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 5 ways as a sum of consecutive naturals, for example, 370236 + ... + 370285.

Almost surely, 2^18513025 is an apocalyptic number.

It is an amenable number.

18513025 is a deficient number, since it is larger than the sum of its proper divisors (4443157).

18513025 is an equidigital number, since it uses as much as digits as its factorization.

18513025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740531 (or 740526 counting only the distinct ones).

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

The square root of 18513025 is about 4302.6764926032. The cubic root of 18513025 is about 264.5406781561.

The spelling of 18513025 in words is "eighteen million, five hundred thirteen thousand, twenty-five".