18025517 has 2 divisors, whose sum is σ = 18025518. Its totient is φ = 18025516.

The previous prime is 18025499. The next prime is 18025523. The reversal of 18025517 is 71552081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9897316 + 8128201 = 3146^2 + 2851^2 .

It is a cyclic number.

It is not a de Polignac number, because 18025517 - 2⁶ = 18025453 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18025517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18025577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9012758 + 9012759.

It is an arithmetic number, because the mean of its divisors is an integer number (9012759).

Almost surely, 2^18025517 is an apocalyptic number.

It is an amenable number.

18025517 is a deficient number, since it is larger than the sum of its proper divisors (1).

18025517 is an equidigital number, since it uses as much as digits as its factorization.

18025517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 18025517 is about 4245.6468294007. The cubic root of 18025517 is about 262.1979206854.

Adding to 18025517 its reverse (71552081), we get a palindrome (89577598).

The spelling of 18025517 in words is "eighteen million, twenty-five thousand, five hundred seventeen".