645331207 has 2 divisors, whose sum is σ = 645331208. Its totient is φ = 645331206.

The previous prime is 645331201. The next prime is 645331241. The reversal of 645331207 is 702133546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645331207 - 2³ = 645331199 is a prime.

It is a Chen prime.

It is equal to p_33563056 and since 645331207 and 33563056 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645331201) 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, 322665603 + 322665604.

It is an arithmetic number, because the mean of its divisors is an integer number (322665604).

Almost surely, 2^645331207 is an apocalyptic number.

645331207 is a deficient number, since it is larger than the sum of its proper divisors (1).

645331207 is an equidigital number, since it uses as much as digits as its factorization.

645331207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 645331207 is about 25403.3699929753. The cubic root of 645331207 is about 864.1601243398.

The spelling of 645331207 in words is "six hundred forty-five million, three hundred thirty-one thousand, two hundred seven".