6905681 has 4 divisors (see below), whose sum is σ = 7205952. Its totient is φ = 6605412.

The previous prime is 6905677. The next prime is 6905699. The reversal of 6905681 is 1865096.

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 6905681 - 2² = 6905677 is a prime.

It is a super-2 number, since 2×6905681² = 95376860147522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6905611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150101 + ... + 150146.

It is an arithmetic number, because the mean of its divisors is an integer number (1801488).

Almost surely, 2^6905681 is an apocalyptic number.

It is an amenable number.

6905681 is a deficient number, since it is larger than the sum of its proper divisors (300271).

6905681 is a wasteful number, since it uses less digits than its factorization.

6905681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300270.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 6905681 is about 2627.8662446936. The cubic root of 6905681 is about 190.4300600004.

The spelling of 6905681 in words is "six million, nine hundred five thousand, six hundred eighty-one".