1994143219 has 2 divisors, whose sum is σ = 1994143220. Its totient is φ = 1994143218.

The previous prime is 1994143187. The next prime is 1994143223. The reversal of 1994143219 is 9123414991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1994143219 - 2⁵ = 1994143187 is a prime.

It is a super-2 number, since 2×1994143219² = 7953214355767363922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1994143279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997071609 + 997071610.

It is an arithmetic number, because the mean of its divisors is an integer number (997071610).

Almost surely, 2^1994143219 is an apocalyptic number.

1994143219 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994143219 is an equidigital number, since it uses as much as digits as its factorization.

1994143219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 43.

The square root of 1994143219 is about 44655.8307391095. The cubic root of 1994143219 is about 1258.6900005029.

The spelling of 1994143219 in words is "one billion, nine hundred ninety-four million, one hundred forty-three thousand, two hundred nineteen".