1999765919 has 2 divisors, whose sum is σ = 1999765920. Its totient is φ = 1999765918.

The previous prime is 1999765897. The next prime is 1999765921. The reversal of 1999765919 is 9195679991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999765919 is a prime.

It is a super-2 number, since 2×1999765919² = 7998127461587829122, which contains 22 as substring.

Together with 1999765921, 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 (1999765969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999882959 + 999882960.

It is an arithmetic number, because the mean of its divisors is an integer number (999882960).

Almost surely, 2^1999765919 is an apocalyptic number.

1999765919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999765919 is an equidigital number, since it uses as much as digits as its factorization.

1999765919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12400290, while the sum is 65.

The square root of 1999765919 is about 44718.7423682733. The cubic root of 1999765919 is about 1259.8718940472.

The spelling of 1999765919 in words is "one billion, nine hundred ninety-nine million, seven hundred sixty-five thousand, nine hundred nineteen".