6943981 has 4 divisors (see below), whose sum is σ = 7575264. Its totient is φ = 6312700.

The previous prime is 6943919. The next prime is 6943991. The reversal of 6943981 is 1893496.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6943981 - 2¹⁷ = 6812909 is a prime.

It is a super-2 number, since 2×6943981² = 96437744256722, 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 (6943991) 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, 315625 + ... + 315646.

It is an arithmetic number, because the mean of its divisors is an integer number (1893816).

Almost surely, 2^6943981 is an apocalyptic number.

It is an amenable number.

6943981 is a deficient number, since it is larger than the sum of its proper divisors (631283).

6943981 is a wasteful number, since it uses less digits than its factorization.

6943981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631282.

The product of its digits is 46656, while the sum is 40.

The square root of 6943981 is about 2635.1434496057. The cubic root of 6943981 is about 190.7814629062.

The spelling of 6943981 in words is "six million, nine hundred forty-three thousand, nine hundred eighty-one".