641240513 has 2 divisors, whose sum is σ = 641240514. Its totient is φ = 641240512.

The previous prime is 641240491. The next prime is 641240531. The reversal of 641240513 is 315042146.

Together with next prime (641240531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 640697344 + 543169 = 25312^2 + 737^2 .

It is a cyclic number.

It is not a de Polignac number, because 641240513 - 2¹² = 641236417 is a prime.

It is a super-2 number, since 2×641240513² = 822378791025006338, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (641240543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320620256 + 320620257.

It is an arithmetic number, because the mean of its divisors is an integer number (320620257).

Almost surely, 2^641240513 is an apocalyptic number.

It is an amenable number.

641240513 is a deficient number, since it is larger than the sum of its proper divisors (1).

641240513 is an equidigital number, since it uses as much as digits as its factorization.

641240513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 641240513 is about 25322.7272030483. The cubic root of 641240513 is about 862.3303092058.

Adding to 641240513 its reverse (315042146), we get a palindrome (956282659).

The spelling of 641240513 in words is "six hundred forty-one million, two hundred forty thousand, five hundred thirteen".