641617941 has 4 divisors (see below), whose sum is σ = 855490592. Its totient is φ = 427745292.

The previous prime is 641617937. The next prime is 641617967. The reversal of 641617941 is 149716146.

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 not a de Polignac number, because 641617941 - 2² = 641617937 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 641617941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641617901) 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, 106936321 + ... + 106936326.

It is an arithmetic number, because the mean of its divisors is an integer number (213872648).

Almost surely, 2^641617941 is an apocalyptic number.

It is an amenable number.

641617941 is a deficient number, since it is larger than the sum of its proper divisors (213872651).

641617941 is a wasteful number, since it uses less digits than its factorization.

641617941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213872650.

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

The square root of 641617941 is about 25330.1784636429. The cubic root of 641617941 is about 862.4994624655.

The spelling of 641617941 in words is "six hundred forty-one million, six hundred seventeen thousand, nine hundred forty-one".