641846837 has 4 divisors (see below), whose sum is σ = 643567980. Its totient is φ = 640125696.

The previous prime is 641846833. The next prime is 641846857. The reversal of 641846837 is 738648146.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 442302961 + 199543876 = 21031^2 + 14126^2 .

It is a cyclic number.

It is not a de Polignac number, because 641846837 - 2² = 641846833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641846791 and 641846800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641846831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 860012 + ... + 860757.

It is an arithmetic number, because the mean of its divisors is an integer number (160891995).

Almost surely, 2^641846837 is an apocalyptic number.

It is an amenable number.

641846837 is a deficient number, since it is larger than the sum of its proper divisors (1721143).

641846837 is a wasteful number, since it uses less digits than its factorization.

641846837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721142.

The product of its digits is 774144, while the sum is 47.

The square root of 641846837 is about 25334.6963076331. The cubic root of 641846837 is about 862.6020152945.

The spelling of 641846837 in words is "six hundred forty-one million, eight hundred forty-six thousand, eight hundred thirty-seven".