645239323 has 2 divisors, whose sum is σ = 645239324. Its totient is φ = 645239322.

The previous prime is 645239317. The next prime is 645239327. The reversal of 645239323 is 323932546.

It is a happy number.

645239323 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645239323 - 2⁵ = 645239291 is a prime.

It is not a weakly prime, because it can be changed into another prime (645239327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322619661 + 322619662.

It is an arithmetic number, because the mean of its divisors is an integer number (322619662).

Almost surely, 2^645239323 is an apocalyptic number.

645239323 is a deficient number, since it is larger than the sum of its proper divisors (1).

645239323 is an equidigital number, since it uses as much as digits as its factorization.

645239323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 37.

The square root of 645239323 is about 25401.5614283847. The cubic root of 645239323 is about 864.1191085757.

The spelling of 645239323 in words is "six hundred forty-five million, two hundred thirty-nine thousand, three hundred twenty-three".