19923831619 has 2 divisors, whose sum is σ = 19923831620. Its totient is φ = 19923831618.

The previous prime is 19923831601. The next prime is 19923831647. The reversal of 19923831619 is 91613832991.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (91613832991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19923831619 - 2⁷ = 19923831491 is a prime.

It is a super-2 number, since 2×19923831619² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19923831019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9961915809 + 9961915810.

It is an arithmetic number, because the mean of its divisors is an integer number (9961915810).

Almost surely, 2^19923831619 is an apocalyptic number.

19923831619 is a deficient number, since it is larger than the sum of its proper divisors (1).

19923831619 is an equidigital number, since it uses as much as digits as its factorization.

19923831619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 52.

The spelling of 19923831619 in words is "nineteen billion, nine hundred twenty-three million, eight hundred thirty-one thousand, six hundred nineteen".