905681 has 8 divisors (see below), whose sum is σ = 1045440. Its totient is φ = 768528.

The previous prime is 905677. The next prime is 905683. The reversal of 905681 is 186509.

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

It is a cyclic number.

It is not a de Polignac number, because 905681 - 2² = 905677 is a prime.

It is a super-2 number, since 2×905681² = 1640516147522, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 905681.

It is not an unprimeable number, because it can be changed into a prime (905683) 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, 170 + ... + 1356.

It is an arithmetic number, because the mean of its divisors is an integer number (130680).

2⁹⁰⁵⁶⁸¹ is an apocalyptic number.

It is an amenable number.

905681 is a deficient number, since it is larger than the sum of its proper divisors (139759).

905681 is a wasteful number, since it uses less digits than its factorization.

905681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 905681 is about 951.6727378674. The cubic root of 905681 is about 96.7516586370.

The spelling of 905681 in words is "nine hundred five thousand, six hundred eighty-one".