1821964019 has 2 divisors, whose sum is σ = 1821964020. Its totient is φ = 1821964018.

The previous prime is 1821963937. The next prime is 1821964061. The reversal of 1821964019 is 9104691281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1821964019 - 2²⁰ = 1820915443 is a prime.

It is a super-2 number, since 2×1821964019² = 6639105773061264722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1821964819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910982009 + 910982010.

It is an arithmetic number, because the mean of its divisors is an integer number (910982010).

Almost surely, 2^1821964019 is an apocalyptic number.

1821964019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821964019 is an equidigital number, since it uses as much as digits as its factorization.

1821964019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1821964019 is about 42684.4704664354. The cubic root of 1821964019 is about 1221.3681728246.

The spelling of 1821964019 in words is "one billion, eight hundred twenty-one million, nine hundred sixty-four thousand, nineteen".