1919818213 has 2 divisors, whose sum is σ = 1919818214. Its totient is φ = 1919818212.

The previous prime is 1919818193. The next prime is 1919818217. The reversal of 1919818213 is 3128189191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1847108484 + 72709729 = 42978^2 + 8527^2 .

It is a cyclic number.

It is not a de Polignac number, because 1919818213 - 2⁵ = 1919818181 is a prime.

It is a super-3 number, since 3×1919818213³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1919818213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1919818217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959909106 + 959909107.

It is an arithmetic number, because the mean of its divisors is an integer number (959909107).

Almost surely, 2^1919818213 is an apocalyptic number.

It is an amenable number.

1919818213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919818213 is an equidigital number, since it uses as much as digits as its factorization.

1919818213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 43.

The square root of 1919818213 is about 43815.7302004657. The cubic root of 1919818213 is about 1242.8537751382.

The spelling of 1919818213 in words is "one billion, nine hundred nineteen million, eight hundred eighteen thousand, two hundred thirteen".