6981631 has 2 divisors, whose sum is σ = 6981632. Its totient is φ = 6981630.

The previous prime is 6981619. The next prime is 6981659. The reversal of 6981631 is 1361896.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6981631 - 2⁵ = 6981599 is a prime.

It is a super-2 number, since 2×6981631² = 97486342840322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6981661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3490815 + 3490816.

It is an arithmetic number, because the mean of its divisors is an integer number (3490816).

Almost surely, 2^6981631 is an apocalyptic number.

6981631 is a deficient number, since it is larger than the sum of its proper divisors (1).

6981631 is an equidigital number, since it uses as much as digits as its factorization.

6981631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 34.

The square root of 6981631 is about 2642.2776159972. The cubic root of 6981631 is about 191.1256448770.

The spelling of 6981631 in words is "six million, nine hundred eighty-one thousand, six hundred thirty-one".