18625289 has 2 divisors, whose sum is σ = 18625290. Its totient is φ = 18625288.

The previous prime is 18625273. The next prime is 18625303. The reversal of 18625289 is 98252681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9504889 + 9120400 = 3083^2 + 3020^2 .

It is an emirp because it is prime and its reverse (98252681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18625289 - 2⁴ = 18625273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18625219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9312644 + 9312645.

It is an arithmetic number, because the mean of its divisors is an integer number (9312645).

Almost surely, 2^18625289 is an apocalyptic number.

It is an amenable number.

18625289 is a deficient number, since it is larger than the sum of its proper divisors (1).

18625289 is an equidigital number, since it uses as much as digits as its factorization.

18625289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 18625289 is about 4315.7026079191. The cubic root of 18625289 is about 265.0743306381.

The spelling of 18625289 in words is "eighteen million, six hundred twenty-five thousand, two hundred eighty-nine".