6865981 has 4 divisors (see below), whose sum is σ = 6871264. Its totient is φ = 6860700.

The previous prime is 6865967. The next prime is 6865997. The reversal of 6865981 is 1895686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6865981 - 2⁵ = 6865949 is a prime.

It is a super-2 number, since 2×6865981² = 94283390184722, which contains 22 as substring.

It is a Duffinian number.

6865981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6865921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826 + ... + 3796.

It is an arithmetic number, because the mean of its divisors is an integer number (1717816).

Almost surely, 2^6865981 is an apocalyptic number.

It is an amenable number.

6865981 is a deficient number, since it is larger than the sum of its proper divisors (5283).

6865981 is a wasteful number, since it uses less digits than its factorization.

6865981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5282.

The product of its digits is 103680, while the sum is 43.

The square root of 6865981 is about 2620.3017001864. The cubic root of 6865981 is about 190.0644379774.

It can be divided in two parts, 68 and 65981, that added together give a square (66049 = 257²).

The spelling of 6865981 in words is "six million, eight hundred sixty-five thousand, nine hundred eighty-one".