1919668609 has 4 divisors (see below), whose sum is σ = 1920022704. Its totient is φ = 1919314516.

The previous prime is 1919668607. The next prime is 1919668613. The reversal of 1919668609 is 9068669191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1919668609 - 2¹ = 1919668607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1919668609.

It is not an unprimeable number, because it can be changed into a prime (1919668607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168787 + ... + 179800.

It is an arithmetic number, because the mean of its divisors is an integer number (480005676).

Almost surely, 2^1919668609 is an apocalyptic number.

It is an amenable number.

1919668609 is a deficient number, since it is larger than the sum of its proper divisors (354095).

1919668609 is an equidigital number, since it uses as much as digits as its factorization.

1919668609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354094.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 1919668609 is about 43814.0229721033. The cubic root of 1919668609 is about 1242.8214907055.

The spelling of 1919668609 in words is "one billion, nine hundred nineteen million, six hundred sixty-eight thousand, six hundred nine".