6981281 has 4 divisors (see below), whose sum is σ = 7001412. Its totient is φ = 6961152.

The previous prime is 6981277. The next prime is 6981283. The reversal of 6981281 is 1821896.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3045025 + 3936256 = 1745^2 + 1984^2 .

It is a cyclic number.

It is not a de Polignac number, because 6981281 - 2² = 6981277 is a prime.

It is a super-2 number, since 2×6981281² = 97476568801922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6981283) 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, 9536 + ... + 10241.

It is an arithmetic number, because the mean of its divisors is an integer number (1750353).

Almost surely, 2^6981281 is an apocalyptic number.

It is an amenable number.

6981281 is a deficient number, since it is larger than the sum of its proper divisors (20131).

6981281 is a wasteful number, since it uses less digits than its factorization.

6981281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20130.

The product of its digits is 6912, while the sum is 35.

The square root of 6981281 is about 2642.2113844278. The cubic root of 6981281 is about 191.1224510152.

The spelling of 6981281 in words is "six million, nine hundred eighty-one thousand, two hundred eighty-one".