6881381 has 8 divisors (see below), whose sum is σ = 7666680. Its totient is φ = 6132672.

The previous prime is 6881359. The next prime is 6881383. The reversal of 6881381 is 1831886.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 168100 + 6713281 = 410^2 + 2591^2 .

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

It is not a de Polignac number, because 6881381 - 2¹⁴ = 6864997 is a prime.

It is a super-2 number, since 2×6881381² = 94706808934322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6881383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8750 + ... + 9503.

It is an arithmetic number, because the mean of its divisors is an integer number (958335).

Almost surely, 2^6881381 is an apocalyptic number.

It is an amenable number.

6881381 is a deficient number, since it is larger than the sum of its proper divisors (785299).

6881381 is a wasteful number, since it uses less digits than its factorization.

6881381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18295.

The product of its digits is 9216, while the sum is 35.

The square root of 6881381 is about 2623.2386471688. The cubic root of 6881381 is about 190.2064330644.

The spelling of 6881381 in words is "six million, eight hundred eighty-one thousand, three hundred eighty-one".