19989579469 has 2 divisors, whose sum is σ = 19989579470. Its totient is φ = 19989579468.

The previous prime is 19989579439. The next prime is 19989579497. The reversal of 19989579469 is 96497598991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12817183369 + 7172396100 = 113213^2 + 84690^2 .

It is a cyclic number.

It is not a de Polignac number, because 19989579469 - 2⁵ = 19989579437 is a prime.

It is a super-2 number, since 2×19989579469² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19989579395 and 19989579404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19989579439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994789734 + 9994789735.

It is an arithmetic number, because the mean of its divisors is an integer number (9994789735).

Almost surely, 2^19989579469 is an apocalyptic number.

It is an amenable number.

19989579469 is a deficient number, since it is larger than the sum of its proper divisors (1).

19989579469 is an equidigital number, since it uses as much as digits as its factorization.

19989579469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 396809280, while the sum is 76.

The spelling of 19989579469 in words is "nineteen billion, nine hundred eighty-nine million, five hundred seventy-nine thousand, four hundred sixty-nine".