1821113 has 8 divisors (see below), whose sum is σ = 2153280. Its totient is φ = 1506960.

The previous prime is 1821107. The next prime is 1821121. The reversal of 1821113 is 3111281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1821113 - 2⁸ = 1820857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1821091 and 1821100.

It is not an unprimeable number, because it can be changed into a prime (1821013) 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, 4283 + ... + 4688.

It is an arithmetic number, because the mean of its divisors is an integer number (269160).

2^1821113 is an apocalyptic number.

It is an amenable number.

1821113 is a deficient number, since it is larger than the sum of its proper divisors (332167).

1821113 is an equidigital number, since it uses as much as digits as its factorization.

1821113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9007.

The product of its digits is 48, while the sum is 17.

The square root of 1821113 is about 1349.4861985215. The cubic root of 1821113 is about 122.1177980742.

Adding to 1821113 its reverse (3111281), we get a palindrome (4932394).

It can be divided in two parts, 182 and 1113, that multiplied together give a triangular number (202566 = T₆₃₆).

The spelling of 1821113 in words is "one million, eight hundred twenty-one thousand, one hundred thirteen".