6981685 has 8 divisors (see below), whose sum is σ = 8582616. Its totient is φ = 5448960.

The previous prime is 6981671. The next prime is 6981697. The reversal of 6981685 is 5861896.

It can be written as a sum of positive squares in 4 ways, for example, as 381924 + 6599761 = 618^2 + 2569^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-6981685 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16824 + ... + 17233.

It is an arithmetic number, because the mean of its divisors is an integer number (1072827).

Almost surely, 2^6981685 is an apocalyptic number.

It is an amenable number.

6981685 is a deficient number, since it is larger than the sum of its proper divisors (1600931).

6981685 is a wasteful number, since it uses less digits than its factorization.

6981685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34103.

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

The square root of 6981685 is about 2642.2878344344. The cubic root of 6981685 is about 191.1261376348.

The spelling of 6981685 in words is "six million, nine hundred eighty-one thousand, six hundred eighty-five".