1821019 has 2 divisors, whose sum is σ = 1821020. Its totient is φ = 1821018.

The previous prime is 1821013. The next prime is 1821037. The reversal of 1821019 is 9101281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1821019 - 2⁷ = 1820891 is a prime.

It is a super-2 number, since 2×1821019² = 6632220396722, which contains 22 as substring.

It is a Chen prime.

1821019 is a lucky number.

It is not a weakly prime, because it can be changed into another 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 as a sum of consecutive naturals, namely, 910509 + 910510.

It is an arithmetic number, because the mean of its divisors is an integer number (910510).

2^1821019 is an apocalyptic number.

1821019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821019 is an equidigital number, since it uses as much as digits as its factorization.

1821019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1821019 is about 1349.4513700019. The cubic root of 1821019 is about 122.1156969286.

The spelling of 1821019 in words is "one million, eight hundred twenty-one thousand, nineteen".