18225539 has 2 divisors, whose sum is σ = 18225540. Its totient is φ = 18225538.

The previous prime is 18225523. The next prime is 18225577. The reversal of 18225539 is 93552281.

It is a weak prime.

It is an emirp because it is prime and its reverse (93552281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18225539 - 2⁴ = 18225523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18225499 and 18225508.

It is not a weakly prime, because it can be changed into another prime (18225589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9112769 + 9112770.

It is an arithmetic number, because the mean of its divisors is an integer number (9112770).

Almost surely, 2^18225539 is an apocalyptic number.

18225539 is a deficient number, since it is larger than the sum of its proper divisors (1).

18225539 is an equidigital number, since it uses as much as digits as its factorization.

18225539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 35.

The square root of 18225539 is about 4269.1379691924. The cubic root of 18225539 is about 263.1641907273.

The spelling of 18225539 in words is "eighteen million, two hundred twenty-five thousand, five hundred thirty-nine".