818613 has 8 divisors (see below), whose sum is σ = 1212800. Its totient is φ = 545724.

The previous prime is 818603. The next prime is 818621. The reversal of 818613 is 316818.

It is not a de Polignac number, because 818613 - 2⁵ = 818581 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 30319 = 818613 / (8 + 1 + 8 + 6 + 1 + 3).

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15133 + ... + 15186.

It is an arithmetic number, because the mean of its divisors is an integer number (151600).

2⁸¹⁸⁶¹³ is an apocalyptic number.

It is an amenable number.

818613 is a deficient number, since it is larger than the sum of its proper divisors (394187).

818613 is a wasteful number, since it uses less digits than its factorization.

818613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30328 (or 30322 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 818613 is about 904.7723470575. The cubic root of 818613 is about 93.5462133450.

It can be divided in two parts, 818 and 613, that added together give a triangular number (1431 = T₅₃).

The spelling of 818613 in words is "eight hundred eighteen thousand, six hundred thirteen".