844130621 has 2 divisors, whose sum is σ = 844130622. Its totient is φ = 844130620.

The previous prime is 844130611. The next prime is 844130663. The reversal of 844130621 is 126031448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 508728025 + 335402596 = 22555^2 + 18314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-844130621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (844130611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422065310 + 422065311.

It is an arithmetic number, because the mean of its divisors is an integer number (422065311).

Almost surely, 2^844130621 is an apocalyptic number.

It is an amenable number.

844130621 is a deficient number, since it is larger than the sum of its proper divisors (1).

844130621 is an equidigital number, since it uses as much as digits as its factorization.

844130621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 844130621 is about 29053.9260858150. The cubic root of 844130621 is about 945.0828556636.

The spelling of 844130621 in words is "eight hundred forty-four million, one hundred thirty thousand, six hundred twenty-one".