6981655 has 4 divisors (see below), whose sum is σ = 8377992. Its totient is φ = 5585320.

The previous prime is 6981631. The next prime is 6981659. The reversal of 6981655 is 5561896.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-6981655 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6981659) 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, 698161 + ... + 698170.

It is an arithmetic number, because the mean of its divisors is an integer number (2094498).

Almost surely, 2^6981655 is an apocalyptic number.

6981655 is a deficient number, since it is larger than the sum of its proper divisors (1396337).

6981655 is a wasteful number, since it uses less digits than its factorization.

6981655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396336.

The product of its digits is 64800, while the sum is 40.

The square root of 6981655 is about 2642.2821575297. The cubic root of 6981655 is about 191.1258638808.

The spelling of 6981655 in words is "six million, nine hundred eighty-one thousand, six hundred fifty-five".