1985599573 has 2 divisors, whose sum is σ = 1985599574. Its totient is φ = 1985599572.

The previous prime is 1985599547. The next prime is 1985599673. The reversal of 1985599573 is 3759955891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1416920164 + 568679409 = 37642^2 + 23847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1985599573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985599673) 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, 992799786 + 992799787.

It is an arithmetic number, because the mean of its divisors is an integer number (992799787).

Almost surely, 2^1985599573 is an apocalyptic number.

It is an amenable number.

1985599573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985599573 is an equidigital number, since it uses as much as digits as its factorization.

1985599573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15309000, while the sum is 61.

The square root of 1985599573 is about 44560.0670219424. The cubic root of 1985599573 is about 1256.8898629638.

The spelling of 1985599573 in words is "one billion, nine hundred eighty-five million, five hundred ninety-nine thousand, five hundred seventy-three".