618281 has 4 divisors (see below), whose sum is σ = 622932. Its totient is φ = 613632.

The previous prime is 618271. The next prime is 618287. The reversal of 618281 is 182816.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 115600 + 502681 = 340^2 + 709^2 .

It is a cyclic number.

It is not a de Polignac number, because 618281 - 2¹⁰ = 617257 is a prime.

It is a super-2 number, since 2×618281² = 764542789922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 618281.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 618281.

It is not an unprimeable number, because it can be changed into a prime (618287) 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 3 ways as a sum of consecutive naturals, for example, 2120 + ... + 2393.

It is an arithmetic number, because the mean of its divisors is an integer number (155733).

2⁶¹⁸²⁸¹ is an apocalyptic number.

It is an amenable number.

618281 is a deficient number, since it is larger than the sum of its proper divisors (4651).

618281 is a wasteful number, since it uses less digits than its factorization.

618281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4650.

The product of its digits is 768, while the sum is 26.

The square root of 618281 is about 786.3084636452. The cubic root of 618281 is about 85.1913107290.

The spelling of 618281 in words is "six hundred eighteen thousand, two hundred eighty-one".