281213 has 4 divisors (see below), whose sum is σ = 290940. Its totient is φ = 271488.

The previous prime is 281207. The next prime is 281227. The reversal of 281213 is 312182.

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 85849 + 195364 = 293^2 + 442^2 .

It is a cyclic number.

It is not a de Polignac number, because 281213 - 2⁸ = 280957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 281191 and 281200.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281213.

It is not an unprimeable number, because it can be changed into a prime (281233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4820 + ... + 4877.

It is an arithmetic number, because the mean of its divisors is an integer number (72735).

2²⁸¹²¹³ is an apocalyptic number.

It is an amenable number.

281213 is a deficient number, since it is larger than the sum of its proper divisors (9727).

281213 is an equidigital number, since it uses as much as digits as its factorization.

281213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9726.

The product of its digits is 96, while the sum is 17.

The square root of 281213 is about 530.2952008080. The cubic root of 281213 is about 65.5156616201.

Adding to 281213 its reverse (312182), we get a palindrome (593395).

It can be divided in two parts, 281 and 213, that added together give a palindrome (494).

The spelling of 281213 in words is "two hundred eighty-one thousand, two hundred thirteen".