918281 has 8 divisors (see below), whose sum is σ = 1130304. Its totient is φ = 726480.

The previous prime is 918263. The next prime is 918283. The reversal of 918281 is 182819.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-918281 is a prime.

It is a super-2 number, since 2×918281² = 1686479989922, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 918281.

It is not an unprimeable number, because it can be changed into a prime (918283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4955 + ... + 5136.

It is an arithmetic number, because the mean of its divisors is an integer number (141288).

2⁹¹⁸²⁸¹ is an apocalyptic number.

918281 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

918281 is a deficient number, since it is larger than the sum of its proper divisors (212023).

918281 is a wasteful number, since it uses less digits than its factorization.

918281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10111.

The product of its digits is 1152, while the sum is 29.

The square root of 918281 is about 958.2697949951. The cubic root of 918281 is about 97.1982694855.

It can be divided in two parts, 91 and 8281, that multiplied together give a cube (753571 = 91³).

The spelling of 918281 in words is "nine hundred eighteen thousand, two hundred eighty-one".