2019539850869 has 2 divisors, whose sum is σ = 2019539850870. Its totient is φ = 2019539850868.

The previous prime is 2019539850817. The next prime is 2019539850871. The reversal of 2019539850869 is 9680589359102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1424828970244 + 594710880625 = 1193662^2 + 771175^2 .

It is a cyclic number.

It is not a de Polignac number, because 2019539850869 - 2⁸ = 2019539850613 is a prime.

It is a super-2 number, since 2×2019539850869² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 2019539850871, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2019539850169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1009769925434 + 1009769925435.

It is an arithmetic number, because the mean of its divisors is an integer number (1009769925435).

Almost surely, 2^{2019539850869} is an apocalyptic number.

It is an amenable number.

2019539850869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2019539850869 is an equidigital number, since it uses as much as digits as its factorization.

2019539850869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41990400, while the sum is 65.

The spelling of 2019539850869 in words is "two trillion, nineteen billion, five hundred thirty-nine million, eight hundred fifty thousand, eight hundred sixty-nine".