6981971 has 4 divisors (see below), whose sum is σ = 6992112. Its totient is φ = 6971832.

The previous prime is 6981967. The next prime is 6981973. The reversal of 6981971 is 1791896.

It is a happy number.

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 6981971 - 2² = 6981967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6981973) 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, 3956 + ... + 5441.

It is an arithmetic number, because the mean of its divisors is an integer number (1748028).

Almost surely, 2^6981971 is an apocalyptic number.

6981971 is a deficient number, since it is larger than the sum of its proper divisors (10141).

6981971 is an equidigital number, since it uses as much as digits as its factorization.

6981971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10140.

The product of its digits is 27216, while the sum is 41.

The square root of 6981971 is about 2642.3419536464. The cubic root of 6981971 is about 191.1287473834.

The spelling of 6981971 in words is "six million, nine hundred eighty-one thousand, nine hundred seventy-one".