6878981 has 2 divisors, whose sum is σ = 6878982. Its totient is φ = 6878980.

The previous prime is 6878959. The next prime is 6878983. The reversal of 6878981 is 1898786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6477025 + 401956 = 2545^2 + 634^2 .

It is a cyclic number.

It is not a de Polignac number, because 6878981 - 2⁶ = 6878917 is a prime.

It is a super-2 number, since 2×6878981² = 94640759196722, which contains 22 as substring.

Together with 6878983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6878983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3439490 + 3439491.

It is an arithmetic number, because the mean of its divisors is an integer number (3439491).

Almost surely, 2^6878981 is an apocalyptic number.

It is an amenable number.

6878981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6878981 is an equidigital number, since it uses as much as digits as its factorization.

6878981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 47.

The square root of 6878981 is about 2622.7811574739. The cubic root of 6878981 is about 190.1843179047.

The spelling of 6878981 in words is "six million, eight hundred seventy-eight thousand, nine hundred eighty-one".