641743513 has 2 divisors, whose sum is σ = 641743514. Its totient is φ = 641743512.

The previous prime is 641743423. The next prime is 641743517. The reversal of 641743513 is 315347146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361114009 + 280629504 = 19003^2 + 16752^2 .

It is a cyclic number.

It is not a de Polignac number, because 641743513 - 2²¹ = 639646361 is a prime.

It is not a weakly prime, because it can be changed into another prime (641743517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320871756 + 320871757.

It is an arithmetic number, because the mean of its divisors is an integer number (320871757).

Almost surely, 2^641743513 is an apocalyptic number.

It is an amenable number.

641743513 is a deficient number, since it is larger than the sum of its proper divisors (1).

641743513 is an equidigital number, since it uses as much as digits as its factorization.

641743513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 34.

The square root of 641743513 is about 25332.6570457976. The cubic root of 641743513 is about 862.5557258121. Note that the first 3 decimals are identical.

The spelling of 641743513 in words is "six hundred forty-one million, seven hundred forty-three thousand, five hundred thirteen".