641513 has 2 divisors, whose sum is σ = 641514. Its totient is φ = 641512.

The previous prime is 641491. The next prime is 641519. The reversal of 641513 is 315146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 458329 + 183184 = 677^2 + 428^2 .

It is a cyclic number.

It is not a de Polignac number, because 641513 - 2¹⁴ = 625129 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (641519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320756 + 320757.

It is an arithmetic number, because the mean of its divisors is an integer number (320757).

2⁶⁴¹⁵¹³ is an apocalyptic number.

It is an amenable number.

641513 is a deficient number, since it is larger than the sum of its proper divisors (1).

641513 is an equidigital number, since it uses as much as digits as its factorization.

641513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 20.

The square root of 641513 is about 800.9450667805. The cubic root of 641513 is about 86.2452437341.

Adding to 641513 its reverse (315146), we get a palindrome (956659).

The spelling of 641513 in words is "six hundred forty-one thousand, five hundred thirteen".