2565402239 has 2 divisors, whose sum is σ = 2565402240. Its totient is φ = 2565402238.

The previous prime is 2565402167. The next prime is 2565402277. The reversal of 2565402239 is 9322045652.

It is an a-pointer prime, because the next prime (2565402277) can be obtained adding 2565402239 to its sum of digits (38).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2565402239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2565402139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282701119 + 1282701120.

It is an arithmetic number, because the mean of its divisors is an integer number (1282701120).

Almost surely, 2^2565402239 is an apocalyptic number.

2565402239 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565402239 is an equidigital number, since it uses as much as digits as its factorization.

2565402239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 2565402239 is about 50649.7999897334. The cubic root of 2565402239 is about 1368.9423415503.

The spelling of 2565402239 in words is "two billion, five hundred sixty-five million, four hundred two thousand, two hundred thirty-nine".