18025649 has 2 divisors, whose sum is σ = 18025650. Its totient is φ = 18025648.

The previous prime is 18025639. The next prime is 18025669. The reversal of 18025649 is 94652081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11343424 + 6682225 = 3368^2 + 2585^2 .

It is an emirp because it is prime and its reverse (94652081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18025649 - 2⁴ = 18025633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18025639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9012824 + 9012825.

It is an arithmetic number, because the mean of its divisors is an integer number (9012825).

Almost surely, 2^18025649 is an apocalyptic number.

It is an amenable number.

18025649 is a deficient number, since it is larger than the sum of its proper divisors (1).

18025649 is an equidigital number, since it uses as much as digits as its factorization.

18025649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 18025649 is about 4245.6623747067. The cubic root of 18025649 is about 262.1985607048.

The spelling of 18025649 in words is "eighteen million, twenty-five thousand, six hundred forty-nine".