19930131819 has 24 divisors (see below), whose sum is σ = 31587388560. Its totient is φ = 12033283392.

The previous prime is 19930131799. The next prime is 19930131827. The reversal of 19930131819 is 91813103991.

It is a happy number.

19930131819 is a `hidden beast` number, since 19 + 9 + 301 + 318 + 19 = 666.

It is not a de Polignac number, because 19930131819 - 2¹⁷ = 19930000747 is a prime.

It is a super-2 number, since 2×19930131819² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19930131839) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1600809 + ... + 1613210.

It is an arithmetic number, because the mean of its divisors is an integer number (1316141190).

Almost surely, 2^19930131819 is an apocalyptic number.

19930131819 is a deficient number, since it is larger than the sum of its proper divisors (11657256741).

19930131819 is a wasteful number, since it uses less digits than its factorization.

19930131819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214091 (or 3214088 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The spelling of 19930131819 in words is "nineteen billion, nine hundred thirty million, one hundred thirty-one thousand, eight hundred nineteen".