641917641 has 8 divisors (see below), whose sum is σ = 900937120. Its totient is φ = 405421632.

The previous prime is 641917613. The next prime is 641917643. The reversal of 641917641 is 146719146.

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

It is not a de Polignac number, because 641917641 - 2¹⁷ = 641786569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641917641.

It is not an unprimeable number, because it can be changed into a prime (641917643) 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, 5630800 + ... + 5630913.

It is an arithmetic number, because the mean of its divisors is an integer number (112617140).

Almost surely, 2^641917641 is an apocalyptic number.

It is an amenable number.

641917641 is a deficient number, since it is larger than the sum of its proper divisors (259019479).

641917641 is a wasteful number, since it uses less digits than its factorization.

641917641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11261735.

The product of its digits is 36288, while the sum is 39.

The square root of 641917641 is about 25336.0936412857. The cubic root of 641917641 is about 862.6337328445.

The spelling of 641917641 in words is "six hundred forty-one million, nine hundred seventeen thousand, six hundred forty-one".