645435239 has 2 divisors, whose sum is σ = 645435240. Its totient is φ = 645435238.

The previous prime is 645435211. The next prime is 645435247. The reversal of 645435239 is 932534546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645435239 - 2⁸ = 645434983 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 645435196 and 645435205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645435139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322717619 + 322717620.

It is an arithmetic number, because the mean of its divisors is an integer number (322717620).

Almost surely, 2^645435239 is an apocalyptic number.

645435239 is a deficient number, since it is larger than the sum of its proper divisors (1).

645435239 is an equidigital number, since it uses as much as digits as its factorization.

645435239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 41.

The square root of 645435239 is about 25405.4175128062. The cubic root of 645435239 is about 864.2065581063.

The spelling of 645435239 in words is "six hundred forty-five million, four hundred thirty-five thousand, two hundred thirty-nine".