641316621 has 8 divisors (see below), whose sum is σ = 932824224. Its totient is φ = 388676720.

The previous prime is 641316617. The next prime is 641316631. The reversal of 641316621 is 126613146.

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 641316621 - 2² = 641316617 is a prime.

It is a super-2 number, since 2×641316621² = 822574016741715282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641316631) 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, 9716886 + ... + 9716951.

It is an arithmetic number, because the mean of its divisors is an integer number (116603028).

Almost surely, 2^641316621 is an apocalyptic number.

It is an amenable number.

641316621 is a deficient number, since it is larger than the sum of its proper divisors (291507603).

641316621 is a wasteful number, since it uses less digits than its factorization.

641316621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19433851.

The product of its digits is 5184, while the sum is 30.

The square root of 641316621 is about 25324.2299191900. The cubic root of 641316621 is about 862.3644241427.

Adding to 641316621 its reverse (126613146), we get a palindrome (767929767).

The spelling of 641316621 in words is "six hundred forty-one million, three hundred sixteen thousand, six hundred twenty-one".