6981669 has 6 divisors (see below), whose sum is σ = 10084646. Its totient is φ = 4654440.

The previous prime is 6981661. The next prime is 6981671. The reversal of 6981669 is 9661896.

Added to its reverse (9661896) it gives a triangular number (16643565 = T₅₇₆₉).

It can be written as a sum of positive squares in only one way, i.e., 6441444 + 540225 = 2538^2 + 735^2 .

It is not a de Polignac number, because 6981669 - 2³ = 6981661 is a prime.

It is a super-2 number, since 2×6981669² = 97487404051122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6981661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 387862 + ... + 387879.

Almost surely, 2^6981669 is an apocalyptic number.

It is an amenable number.

6981669 is a deficient number, since it is larger than the sum of its proper divisors (3102977).

6981669 is a wasteful number, since it uses less digits than its factorization.

6981669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775747 (or 775744 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 6981669 is about 2642.2848067534. The cubic root of 6981669 is about 191.1259916327.

Adding to 6981669 its reverse (9661896), we get a triangular number (16643565 = T₅₇₆₉).

The spelling of 6981669 in words is "six million, nine hundred eighty-one thousand, six hundred sixty-nine".