6831661 has 2 divisors, whose sum is σ = 6831662. Its totient is φ = 6831660.

The previous prime is 6831653. The next prime is 6831703. The reversal of 6831661 is 1661386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5851561 + 980100 = 2419^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 6831661 - 2³ = 6831653 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 (6831611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3415830 + 3415831.

It is an arithmetic number, because the mean of its divisors is an integer number (3415831).

Almost surely, 2^6831661 is an apocalyptic number.

It is an amenable number.

6831661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6831661 is an equidigital number, since it uses as much as digits as its factorization.

6831661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 6831661 is about 2613.7446317496. The cubic root of 6831661 is about 189.7472261886.

The spelling of 6831661 in words is "six million, eight hundred thirty-one thousand, six hundred sixty-one".