645813341 has 2 divisors, whose sum is σ = 645813342. Its totient is φ = 645813340.

The previous prime is 645813331. The next prime is 645813349. The reversal of 645813341 is 143318546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639331225 + 6482116 = 25285^2 + 2546^2 .

It is a cyclic number.

It is not a de Polignac number, because 645813341 - 2¹⁰ = 645812317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645813349) 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, 322906670 + 322906671.

It is an arithmetic number, because the mean of its divisors is an integer number (322906671).

Almost surely, 2^645813341 is an apocalyptic number.

It is an amenable number.

645813341 is a deficient number, since it is larger than the sum of its proper divisors (1).

645813341 is an equidigital number, since it uses as much as digits as its factorization.

645813341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 35.

The square root of 645813341 is about 25412.8577889225. The cubic root of 645813341 is about 864.3752785929.

The spelling of 645813341 in words is "six hundred forty-five million, eight hundred thirteen thousand, three hundred forty-one".