1813613 has 2 divisors, whose sum is σ = 1813614. Its totient is φ = 1813612.

The previous prime is 1813597. The next prime is 1813627. The reversal of 1813613 is 3163181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1044484 + 769129 = 1022^2 + 877^2 .

1813613 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 1813613 - 2⁴ = 1813597 is a prime.

It is a super-2 number, since 2×1813613² = 6578384227538, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1813673) 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 as a sum of consecutive naturals, namely, 906806 + 906807.

It is an arithmetic number, because the mean of its divisors is an integer number (906807).

2^1813613 is an apocalyptic number.

It is an amenable number.

1813613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813613 is an equidigital number, since it uses as much as digits as its factorization.

1813613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 1813613 is about 1346.7044961683. The cubic root of 1813613 is about 121.9499257011.

Subtracting from 1813613 its product of digits (432), we obtain a palindrome (1813181).

Adding to 1813613 its reverse (3163181), we get a palindrome (4976794).

It can be divided in two parts, 18 and 13613, that added together give a palindrome (13631).

The spelling of 1813613 in words is "one million, eight hundred thirteen thousand, six hundred thirteen".