253665239 has 2 divisors, whose sum is σ = 253665240. Its totient is φ = 253665238.

The previous prime is 253665187. The next prime is 253665241. The reversal of 253665239 is 932566352.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253665239 is a prime.

It is a Sophie Germain prime.

Together with 253665241, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 253665196 and 253665205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253665259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126832619 + 126832620.

It is an arithmetic number, because the mean of its divisors is an integer number (126832620).

Almost surely, 2^253665239 is an apocalyptic number.

253665239 is a deficient number, since it is larger than the sum of its proper divisors (1).

253665239 is an equidigital number, since it uses as much as digits as its factorization.

253665239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 41.

The square root of 253665239 is about 15926.8716011651. The cubic root of 253665239 is about 633.0242090391.

The spelling of 253665239 in words is "two hundred fifty-three million, six hundred sixty-five thousand, two hundred thirty-nine".