909681 has 8 divisors (see below), whose sum is σ = 1217760. Its totient is φ = 604032.

The previous prime is 909679. The next prime is 909683. The reversal of 909681 is 186909.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (909679) and next prime (909683).

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

It is not a de Polignac number, because 909681 - 2¹ = 909679 is a prime.

It is a super-2 number, since 2×909681² = 1655039043522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (909683) 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, 630 + ... + 1488.

It is an arithmetic number, because the mean of its divisors is an integer number (152220).

2⁹⁰⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

909681 is a deficient number, since it is larger than the sum of its proper divisors (308079).

909681 is a wasteful number, since it uses less digits than its factorization.

909681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 909681 is about 953.7719853298. The cubic root of 909681 is about 96.8938861548.

The spelling of 909681 in words is "nine hundred nine thousand, six hundred eighty-one".