1643485539 has 16 divisors (see below), whose sum is σ = 2289139200. Its totient is φ = 1046850816.

The previous prime is 1643485531. The next prime is 1643485567. The reversal of 1643485539 is 9355843461.

It is not a de Polignac number, because 1643485539 - 2³ = 1643485531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1643485531) 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 in 15 ways as a sum of consecutive naturals, for example, 51282 + ... + 76920.

It is an arithmetic number, because the mean of its divisors is an integer number (143071200).

Almost surely, 2^1643485539 is an apocalyptic number.

1643485539 is a deficient number, since it is larger than the sum of its proper divisors (645653661).

1643485539 is a wasteful number, since it uses less digits than its factorization.

1643485539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26594.

The product of its digits is 1555200, while the sum is 48.

The square root of 1643485539 is about 40539.9252466010. The cubic root of 1643485539 is about 1180.1085648940.

The spelling of 1643485539 in words is "one billion, six hundred forty-three million, four hundred eighty-five thousand, five hundred thirty-nine".