19820908969 has 2 divisors, whose sum is σ = 19820908970. Its totient is φ = 19820908968.

The previous prime is 19820908903. The next prime is 19820908981. The reversal of 19820908969 is 96980902891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10524092569 + 9296816400 = 102587^2 + 96420^2 .

It is an emirp because it is prime and its reverse (96980902891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19820908969 - 2²⁵ = 19787354537 is a prime.

It is a super-2 number, since 2×19820908969² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19820908169) 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 as a sum of consecutive naturals, namely, 9910454484 + 9910454485.

It is an arithmetic number, because the mean of its divisors is an integer number (9910454485).

Almost surely, 2^19820908969 is an apocalyptic number.

It is an amenable number.

19820908969 is a deficient number, since it is larger than the sum of its proper divisors (1).

19820908969 is an equidigital number, since it uses as much as digits as its factorization.

19820908969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5038848, while the sum is 61.

The spelling of 19820908969 in words is "nineteen billion, eight hundred twenty million, nine hundred eight thousand, nine hundred sixty-nine".