6989687 has 2 divisors, whose sum is σ = 6989688. Its totient is φ = 6989686.

The previous prime is 6989659. The next prime is 6989713. The reversal of 6989687 is 7869896.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6989687 - 2¹⁸ = 6727543 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6989617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494843 + 3494844.

It is an arithmetic number, because the mean of its divisors is an integer number (3494844).

Almost surely, 2^6989687 is an apocalyptic number.

6989687 is a deficient number, since it is larger than the sum of its proper divisors (1).

6989687 is an equidigital number, since it uses as much as digits as its factorization.

6989687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 53.

The square root of 6989687 is about 2643.8016188814. The cubic root of 6989687 is about 191.1991289649.

The spelling of 6989687 in words is "six million, nine hundred eighty-nine thousand, six hundred eighty-seven".