918681 has 8 divisors (see below), whose sum is σ = 1229760. Its totient is φ = 610032.

The previous prime is 918679. The next prime is 918683. The reversal of 918681 is 186819.

It is an interprime number because it is at equal distance from previous prime (918679) and next prime (918683).

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

It is not a de Polignac number, because 918681 - 2¹ = 918679 is a prime.

It is a super-2 number, since 2×918681² = 1687949559522, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 918681.

It is not an unprimeable number, because it can be changed into a prime (918683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 651 + ... + 1503.

It is an arithmetic number, because the mean of its divisors is an integer number (153720).

2⁹¹⁸⁶⁸¹ is an apocalyptic number.

It is an amenable number.

918681 is a deficient number, since it is larger than the sum of its proper divisors (311079).

918681 is a wasteful number, since it uses less digits than its factorization.

918681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215.

The product of its digits is 3456, while the sum is 33.

The square root of 918681 is about 958.4784817616. The cubic root of 918681 is about 97.2123805125.

The spelling of 918681 in words is "nine hundred eighteen thousand, six hundred eighty-one".