641602513 has 8 divisors (see below), whose sum is σ = 650349000. Its totient is φ = 632890368.

The previous prime is 641602501. The next prime is 641602517. The reversal of 641602513 is 315206146.

641602513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 13749264 + 627853249 = 3708^2 + 25057^2 .

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 641602513 - 2⁹ = 641602001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641602517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30213 + ... + 46861.

It is an arithmetic number, because the mean of its divisors is an integer number (81293625).

Almost surely, 2^641602513 is an apocalyptic number.

It is an amenable number.

641602513 is a deficient number, since it is larger than the sum of its proper divisors (8746487).

641602513 is a wasteful number, since it uses less digits than its factorization.

641602513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17171.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 641602513 is about 25329.8739238868. The cubic root of 641602513 is about 862.4925493440.

Adding to 641602513 its reverse (315206146), we get a palindrome (956808659).

The spelling of 641602513 in words is "six hundred forty-one million, six hundred two thousand, five hundred thirteen".