1813817 has 2 divisors, whose sum is σ = 1813818. Its totient is φ = 1813816.

The previous prime is 1813813. The next prime is 1813829. The reversal of 1813817 is 7183181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1336336 + 477481 = 1156^2 + 691^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813817 - 2² = 1813813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1813817.

It is not a weakly prime, because it can be changed into another prime (1813813) 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, 906908 + 906909.

It is an arithmetic number, because the mean of its divisors is an integer number (906909).

2^1813817 is an apocalyptic number.

It is an amenable number.

1813817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813817 is an equidigital number, since it uses as much as digits as its factorization.

1813817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 29.

The square root of 1813817 is about 1346.7802344852. The cubic root of 1813817 is about 121.9544979467.

Adding to 1813817 its reverse (7183181), we get a palindrome (8996998).

The spelling of 1813817 in words is "one million, eight hundred thirteen thousand, eight hundred seventeen".