19791273989 has 8 divisors (see below), whose sum is σ = 20512656120. Its totient is φ = 19079706816.

The previous prime is 19791273919. The next prime is 19791273991. The reversal of 19791273989 is 98937219791.

It can be written as a sum of positive squares in 4 ways, for example, as 2699633764 + 17091640225 = 51958^2 + 130735^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19791273989 - 2¹² = 19791269893 is a prime.

It is a super-2 number, since 2×19791273989² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19791273919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2449634 + ... + 2457699.

It is an arithmetic number, because the mean of its divisors is an integer number (2564082015).

Almost surely, 2^19791273989 is an apocalyptic number.

It is an amenable number.

19791273989 is a deficient number, since it is larger than the sum of its proper divisors (721382131).

19791273989 is a wasteful number, since it uses less digits than its factorization.

19791273989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4907479.

The product of its digits is 15431472, while the sum is 65.

The spelling of 19791273989 in words is "nineteen billion, seven hundred ninety-one million, two hundred seventy-three thousand, nine hundred eighty-nine".