6999681 has 8 divisors (see below), whose sum is σ = 10050880. Its totient is φ = 4307472.

The previous prime is 6999673. The next prime is 6999703. The reversal of 6999681 is 1869996.

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

It is not a de Polignac number, because 6999681 - 2³ = 6999673 is a prime.

It is a super-2 number, since 2×6999681² = 97991068203522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6999681.

It is not an unprimeable number, because it can be changed into a prime (6999611) 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 7 ways as a sum of consecutive naturals, for example, 89701 + ... + 89778.

It is an arithmetic number, because the mean of its divisors is an integer number (1256360).

Almost surely, 2^6999681 is an apocalyptic number.

It is an amenable number.

6999681 is a deficient number, since it is larger than the sum of its proper divisors (3051199).

6999681 is a wasteful number, since it uses less digits than its factorization.

6999681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179495.

The product of its digits is 209952, while the sum is 48.

The square root of 6999681 is about 2645.6910250443. The cubic root of 6999681 is about 191.2902123995.

The spelling of 6999681 in words is "six million, nine hundred ninety-nine thousand, six hundred eighty-one".