641501513 has 8 divisors (see below), whose sum is σ = 653301600. Its totient is φ = 629732448.

The previous prime is 641501479. The next prime is 641501519. The reversal of 641501513 is 315105146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641501513 - 2¹⁸ = 641239369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641501519) 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 7 ways as a sum of consecutive naturals, for example, 36245 + ... + 50957.

It is an arithmetic number, because the mean of its divisors is an integer number (81662700).

Almost surely, 2^641501513 is an apocalyptic number.

It is an amenable number.

641501513 is a deficient number, since it is larger than the sum of its proper divisors (11800087).

641501513 is a wasteful number, since it uses less digits than its factorization.

641501513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15511.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 641501513 is about 25327.8801521170. The cubic root of 641501513 is about 862.4472895884.

Adding to 641501513 its reverse (315105146), we get a palindrome (956606659).

The spelling of 641501513 in words is "six hundred forty-one million, five hundred one thousand, five hundred thirteen".