641503513 has 4 divisors (see below), whose sum is σ = 733146880. Its totient is φ = 549860148.

The previous prime is 641503481. The next prime is 641503547. The reversal of 641503513 is 315305146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 641503513 - 2⁵ = 641503481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641500513) 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 in 3 ways as a sum of consecutive naturals, for example, 45821673 + ... + 45821686.

It is an arithmetic number, because the mean of its divisors is an integer number (183286720).

Almost surely, 2^641503513 is an apocalyptic number.

It is an amenable number.

641503513 is a deficient number, since it is larger than the sum of its proper divisors (91643367).

641503513 is an equidigital number, since it uses as much as digits as its factorization.

641503513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91643366.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 641503513 is about 25327.9196342692. The cubic root of 641503513 is about 862.4481858673.

Adding to 641503513 its reverse (315305146), we get a palindrome (956808659).

The spelling of 641503513 in words is "six hundred forty-one million, five hundred three thousand, five hundred thirteen".