19550590109 has 2 divisors, whose sum is σ = 19550590110. Its totient is φ = 19550590108.

The previous prime is 19550590067. The next prime is 19550590117. The reversal of 19550590109 is 90109505591.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18117967609 + 1432622500 = 134603^2 + 37850^2 .

It is a cyclic number.

It is not a de Polignac number, because 19550590109 - 2³² = 15255622813 is a prime.

It is a super-2 number, since 2×19550590109² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19550590109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19550590139) 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, 9775295054 + 9775295055.

It is an arithmetic number, because the mean of its divisors is an integer number (9775295055).

Almost surely, 2^19550590109 is an apocalyptic number.

It is an amenable number.

19550590109 is a deficient number, since it is larger than the sum of its proper divisors (1).

19550590109 is an equidigital number, since it uses as much as digits as its factorization.

19550590109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91125, while the sum is 44.

The spelling of 19550590109 in words is "nineteen billion, five hundred fifty million, five hundred ninety thousand, one hundred nine".