6981889 has 2 divisors, whose sum is σ = 6981890. Its totient is φ = 6981888.

The previous prime is 6981859. The next prime is 6981943. The reversal of 6981889 is 9881896.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4928400 + 2053489 = 2220^2 + 1433^2 .

It is a cyclic number.

It is not a de Polignac number, because 6981889 - 2¹⁵ = 6949121 is a prime.

It is not a weakly prime, because it can be changed into another prime (6981829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3490944 + 3490945.

It is an arithmetic number, because the mean of its divisors is an integer number (3490945).

Almost surely, 2^6981889 is an apocalyptic number.

It is an amenable number.

6981889 is a deficient number, since it is larger than the sum of its proper divisors (1).

6981889 is an equidigital number, since it uses as much as digits as its factorization.

6981889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 49.

The square root of 6981889 is about 2642.3264370626. The cubic root of 6981889 is about 191.1279991411.

Adding to 6981889 its product of digits (248832), we get a square (7230721 = 2689²).

The spelling of 6981889 in words is "six million, nine hundred eighty-one thousand, eight hundred eighty-nine".