6631789 has 2 divisors, whose sum is σ = 6631790. Its totient is φ = 6631788.

The previous prime is 6631763. The next prime is 6631871. The reversal of 6631789 is 9871366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5546025 + 1085764 = 2355^2 + 1042^2 .

It is a cyclic number.

It is not a de Polignac number, because 6631789 - 2⁷ = 6631661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6631739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3315894 + 3315895.

It is an arithmetic number, because the mean of its divisors is an integer number (3315895).

Almost surely, 2^6631789 is an apocalyptic number.

It is an amenable number.

6631789 is a deficient number, since it is larger than the sum of its proper divisors (1).

6631789 is an equidigital number, since it uses as much as digits as its factorization.

6631789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 6631789 is about 2575.2260094990. The cubic root of 6631789 is about 187.8784203351.

The spelling of 6631789 in words is "six million, six hundred thirty-one thousand, seven hundred eighty-nine".