1811413 has 2 divisors, whose sum is σ = 1811414. Its totient is φ = 1811412.

The previous prime is 1811389. The next prime is 1811431. The reversal of 1811413 is 3141181.

Together with next prime (1811431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 996004 + 815409 = 998^2 + 903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1811413 is a prime.

1811413 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1811443) 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, 905706 + 905707.

It is an arithmetic number, because the mean of its divisors is an integer number (905707).

2^1811413 is an apocalyptic number.

It is an amenable number.

1811413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1811413 is an equidigital number, since it uses as much as digits as its factorization.

1811413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 19.

The square root of 1811413 is about 1345.8874395729. The cubic root of 1811413 is about 121.9005953694.

Adding to 1811413 its reverse (3141181), we get a palindrome (4952594).

The spelling of 1811413 in words is "one million, eight hundred eleven thousand, four hundred thirteen".