1821107 has 2 divisors, whose sum is σ = 1821108. Its totient is φ = 1821106.

The previous prime is 1821101. The next prime is 1821121. The reversal of 1821107 is 7011281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1821107 - 2¹⁶ = 1755571 is a prime.

It is a Chen prime.

It is equal to p₁₃₆₅₃₂ and since 1821107 and 136532 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1821101) 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, 910553 + 910554.

It is an arithmetic number, because the mean of its divisors is an integer number (910554).

2^1821107 is an apocalyptic number.

1821107 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821107 is an equidigital number, since it uses as much as digits as its factorization.

1821107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 1821107 is about 1349.4839754514. The cubic root of 1821107 is about 122.1176639607.

Adding to 1821107 its reverse (7011281), we get a palindrome (8832388).

The spelling of 1821107 in words is "one million, eight hundred twenty-one thousand, one hundred seven".