1999969919 has 2 divisors, whose sum is σ = 1999969920. Its totient is φ = 1999969918.

The previous prime is 1999969903. The next prime is 1999969921. The reversal of 1999969919 is 9199699991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1999969919 - 2⁴ = 1999969903 is a prime.

It is a super-2 number, since 2×1999969919² = 7999759353809733122, which contains 22 as substring.

Together with 1999969921, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999969219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999984959 + 999984960.

It is an arithmetic number, because the mean of its divisors is an integer number (999984960).

Almost surely, 2^1999969919 is an apocalyptic number.

1999969919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999969919 is an equidigital number, since it uses as much as digits as its factorization.

1999969919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28697814, while the sum is 71.

The square root of 1999969919 is about 44721.0232329270. The cubic root of 1999969919 is about 1259.9147332490.

The spelling of 1999969919 in words is "one billion, nine hundred ninety-nine million, nine hundred sixty-nine thousand, nine hundred nineteen".