613281 has 4 divisors (see below), whose sum is σ = 817712. Its totient is φ = 408852.

The previous prime is 613279. The next prime is 613289. The reversal of 613281 is 182316.

613281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 613281 - 2¹ = 613279 is a prime.

It is a super-2 number, since 2×613281² = 752227169922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (613289) 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, 102211 + ... + 102216.

It is an arithmetic number, because the mean of its divisors is an integer number (204428).

2⁶¹³²⁸¹ is an apocalyptic number.

It is an amenable number.

613281 is a deficient number, since it is larger than the sum of its proper divisors (204431).

613281 is a wasteful number, since it uses less digits than its factorization.

613281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204430.

The product of its digits is 288, while the sum is 21.

The square root of 613281 is about 783.1225957665. The cubic root of 613281 is about 84.9610432786.

Adding to 613281 its reverse (182316), we get a palindrome (795597).

The spelling of 613281 in words is "six hundred thirteen thousand, two hundred eighty-one".