1985514109 has 2 divisors, whose sum is σ = 1985514110. Its totient is φ = 1985514108.

The previous prime is 1985514103. The next prime is 1985514119. The reversal of 1985514109 is 9014155891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1696616100 + 288898009 = 41190^2 + 16997^2 .

It is a cyclic number.

It is not a de Polignac number, because 1985514109 - 2³ = 1985514101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985514101) 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, 992757054 + 992757055.

It is an arithmetic number, because the mean of its divisors is an integer number (992757055).

Almost surely, 2^1985514109 is an apocalyptic number.

It is an amenable number.

1985514109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985514109 is an equidigital number, since it uses as much as digits as its factorization.

1985514109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 43.

The square root of 1985514109 is about 44559.1080364049. The cubic root of 1985514109 is about 1256.8718297246.

The spelling of 1985514109 in words is "one billion, nine hundred eighty-five million, five hundred fourteen thousand, one hundred nine".