6981139 has 4 divisors (see below), whose sum is σ = 7615800. Its totient is φ = 6346480.

The previous prime is 6981133. The next prime is 6981157. The reversal of 6981139 is 9311896.

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

It is a cyclic number.

It is not a de Polignac number, because 6981139 - 2⁷ = 6981011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6981098 and 6981107.

It is not an unprimeable number, because it can be changed into a prime (6981133) 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, 317314 + ... + 317335.

It is an arithmetic number, because the mean of its divisors is an integer number (1903950).

Almost surely, 2^6981139 is an apocalyptic number.

6981139 is a deficient number, since it is larger than the sum of its proper divisors (634661).

6981139 is a wasteful number, since it uses less digits than its factorization.

6981139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634660.

The product of its digits is 11664, while the sum is 37.

The square root of 6981139 is about 2642.1845128605. The cubic root of 6981139 is about 191.1211551894.

The spelling of 6981139 in words is "six million, nine hundred eighty-one thousand, one hundred thirty-nine".