645515459 has 2 divisors, whose sum is σ = 645515460. Its totient is φ = 645515458.

The previous prime is 645515413. The next prime is 645515467. The reversal of 645515459 is 954515546.

645515459 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 645515459 - 2¹⁶ = 645449923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (645515489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322757729 + 322757730.

It is an arithmetic number, because the mean of its divisors is an integer number (322757730).

Almost surely, 2^645515459 is an apocalyptic number.

645515459 is a deficient number, since it is larger than the sum of its proper divisors (1).

645515459 is an equidigital number, since it uses as much as digits as its factorization.

645515459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540000, while the sum is 44.

The square root of 645515459 is about 25406.9962608727. The cubic root of 645515459 is about 864.2423601893.

The spelling of 645515459 in words is "six hundred forty-five million, five hundred fifteen thousand, four hundred fifty-nine".