1996128919 has 2 divisors, whose sum is σ = 1996128920. Its totient is φ = 1996128918.

The previous prime is 1996128917. The next prime is 1996128943. The reversal of 1996128919 is 9198216991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1996128919 - 2¹ = 1996128917 is a prime.

It is a super-2 number, since 2×1996128919² = 7969061322536217122, which contains 22 as substring.

Together with 1996128917, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1996128919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1996128917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998064459 + 998064460.

It is an arithmetic number, because the mean of its divisors is an integer number (998064460).

Almost surely, 2^1996128919 is an apocalyptic number.

1996128919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1996128919 is an equidigital number, since it uses as much as digits as its factorization.

1996128919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 55.

The square root of 1996128919 is about 44678.0585858428. The cubic root of 1996128919 is about 1259.1076488057.

The spelling of 1996128919 in words is "one billion, nine hundred ninety-six million, one hundred twenty-eight thousand, nine hundred nineteen".