6785981 has 4 divisors (see below), whose sum is σ = 6793500. Its totient is φ = 6778464.

The previous prime is 6785969. The next prime is 6786037. The reversal of 6785981 is 1895876.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3118756 + 3667225 = 1766^2 + 1915^2 .

It is a cyclic number.

It is not a de Polignac number, because 6785981 - 2⁶ = 6785917 is a prime.

It is a super-2 number, since 2×6785981² = 92099076264722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6785081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2186 + ... + 4283.

It is an arithmetic number, because the mean of its divisors is an integer number (1698375).

Almost surely, 2^6785981 is an apocalyptic number.

It is an amenable number.

6785981 is a deficient number, since it is larger than the sum of its proper divisors (7519).

6785981 is a wasteful number, since it uses less digits than its factorization.

6785981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7518.

The product of its digits is 120960, while the sum is 44.

The square root of 6785981 is about 2604.9915546888. The cubic root of 6785981 is about 189.3233642038.

Adding to 6785981 its sum of digits (44), we get a square (6786025 = 2605²).

The spelling of 6785981 in words is "six million, seven hundred eighty-five thousand, nine hundred eighty-one".