6917681 has 4 divisors (see below), whose sum is σ = 7140864. Its totient is φ = 6694500.

The previous prime is 6917663. The next prime is 6917693. The reversal of 6917681 is 1867196.

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 a de Polignac number, because none of the positive numbers 2^k-6917681 is a prime.

It is a super-2 number, since 2×6917681² = 95708620835522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6917611) 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 3 ways as a sum of consecutive naturals, for example, 111545 + ... + 111606.

It is an arithmetic number, because the mean of its divisors is an integer number (1785216).

Almost surely, 2^6917681 is an apocalyptic number.

It is an amenable number.

6917681 is a deficient number, since it is larger than the sum of its proper divisors (223183).

6917681 is a wasteful number, since it uses less digits than its factorization.

6917681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223182.

The product of its digits is 18144, while the sum is 38.

The square root of 6917681 is about 2630.1484748964. The cubic root of 6917681 is about 190.5402995918.

The spelling of 6917681 in words is "six million, nine hundred seventeen thousand, six hundred eighty-one".