1985910282809 has 2 divisors, whose sum is σ = 1985910282810. Its totient is φ = 1985910282808.

The previous prime is 1985910282689. The next prime is 1985910282823. The reversal of 1985910282809 is 9082820195891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1938229193209 + 47681089600 = 1392203^2 + 218360^2 .

It is a cyclic number.

It is not a de Polignac number, because 1985910282809 - 2²⁴ = 1985893505593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1985910281809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992955141404 + 992955141405.

It is an arithmetic number, because the mean of its divisors is an integer number (992955141405).

Almost surely, 2^{1985910282809} is an apocalyptic number.

It is an amenable number.

1985910282809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985910282809 is an equidigital number, since it uses as much as digits as its factorization.

1985910282809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7464960, while the sum is 62.

The spelling of 1985910282809 in words is "one trillion, nine hundred eighty-five billion, nine hundred ten million, two hundred eighty-two thousand, eight hundred nine".