25238009 has 2 divisors, whose sum is σ = 25238010. Its totient is φ = 25238008.

The previous prime is 25237991. The next prime is 25238011. The reversal of 25238009 is 90083252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13162384 + 12075625 = 3628^2 + 3475^2 .

It is a cyclic number.

It is not a de Polignac number, because 25238009 - 2⁸ = 25237753 is a prime.

Together with 25238011, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (25238039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12619004 + 12619005.

It is an arithmetic number, because the mean of its divisors is an integer number (12619005).

Almost surely, 2^25238009 is an apocalyptic number.

It is an amenable number.

25238009 is a deficient number, since it is larger than the sum of its proper divisors (1).

25238009 is an equidigital number, since it uses as much as digits as its factorization.

25238009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 25238009 is about 5023.7445197781. The cubic root of 25238009 is about 293.3267679603.

The spelling of 25238009 in words is "twenty-five million, two hundred thirty-eight thousand, nine".