645803413 has 2 divisors, whose sum is σ = 645803414. Its totient is φ = 645803412.

The previous prime is 645803383. The next prime is 645803437. The reversal of 645803413 is 314308546.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 505665169 + 140138244 = 22487^2 + 11838^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645803413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645203413) 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, 322901706 + 322901707.

It is an arithmetic number, because the mean of its divisors is an integer number (322901707).

Almost surely, 2^645803413 is an apocalyptic number.

It is an amenable number.

645803413 is a deficient number, since it is larger than the sum of its proper divisors (1).

645803413 is an equidigital number, since it uses as much as digits as its factorization.

645803413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 645803413 is about 25412.6624539815. The cubic root of 645803413 is about 864.3708492626.

The spelling of 645803413 in words is "six hundred forty-five million, eight hundred three thousand, four hundred thirteen".