19191628906 has 8 divisors (see below), whose sum is σ = 28795639140. Its totient is φ = 9593082528.

The previous prime is 19191628879. The next prime is 19191628909. The reversal of 19191628906 is 60982619191.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13698595681 + 5493033225 = 117041^2 + 74115^2 .

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

It is a super-2 number, since 2×19191628906² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19191628909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1357171 + ... + 1371238.

Almost surely, 2^19191628906 is an apocalyptic number.

19191628906 is a deficient number, since it is larger than the sum of its proper divisors (9604010234).

19191628906 is a wasteful number, since it uses less digits than its factorization.

19191628906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2731928.

The product of its (nonzero) digits is 419904, while the sum is 52.

The spelling of 19191628906 in words is "nineteen billion, one hundred ninety-one million, six hundred twenty-eight thousand, nine hundred six".