6442145239 has 2 divisors, whose sum is σ = 6442145240. Its totient is φ = 6442145238.

The previous prime is 6442145209. The next prime is 6442145243. The reversal of 6442145239 is 9325412446.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6442145239 - 2¹⁹ = 6441620951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6442145209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3221072619 + 3221072620.

It is an arithmetic number, because the mean of its divisors is an integer number (3221072620).

Almost surely, 2^6442145239 is an apocalyptic number.

6442145239 is a deficient number, since it is larger than the sum of its proper divisors (1).

6442145239 is an equidigital number, since it uses as much as digits as its factorization.

6442145239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 40.

The square root of 6442145239 is about 80262.9755179809. The cubic root of 6442145239 is about 1860.7020549945.

The spelling of 6442145239 in words is "six billion, four hundred forty-two million, one hundred forty-five thousand, two hundred thirty-nine".