1985523329 has 4 divisors (see below), whose sum is σ = 1987072176. Its totient is φ = 1983974484.

The previous prime is 1985523301. The next prime is 1985523467. The reversal of 1985523329 is 9233255891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9233255891 = 47 ⋅196452253.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1985523329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1985523229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 772499 + ... + 775064.

It is an arithmetic number, because the mean of its divisors is an integer number (496768044).

Almost surely, 2^1985523329 is an apocalyptic number.

It is an amenable number.

1985523329 is a deficient number, since it is larger than the sum of its proper divisors (1548847).

1985523329 is a wasteful number, since it uses less digits than its factorization.

1985523329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548846.

The product of its digits is 583200, while the sum is 47.

The square root of 1985523329 is about 44559.2114943701. The cubic root of 1985523329 is about 1256.8737752057.

The spelling of 1985523329 in words is "one billion, nine hundred eighty-five million, five hundred twenty-three thousand, three hundred twenty-nine".