645025597 has 2 divisors, whose sum is σ = 645025598. Its totient is φ = 645025596.

The previous prime is 645025559. The next prime is 645025609. The reversal of 645025597 is 795520546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371487076 + 273538521 = 19274^2 + 16539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645025597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645025517) 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, 322512798 + 322512799.

It is an arithmetic number, because the mean of its divisors is an integer number (322512799).

Almost surely, 2^645025597 is an apocalyptic number.

It is an amenable number.

645025597 is a deficient number, since it is larger than the sum of its proper divisors (1).

645025597 is an equidigital number, since it uses as much as digits as its factorization.

645025597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378000, while the sum is 43.

The square root of 645025597 is about 25397.3541338463. The cubic root of 645025597 is about 864.0236891403.

The spelling of 645025597 in words is "six hundred forty-five million, twenty-five thousand, five hundred ninety-seven".