1659520889 has 4 divisors (see below), whose sum is σ = 1787176356. Its totient is φ = 1531865424.

The previous prime is 1659520871. The next prime is 1659520897. The reversal of 1659520889 is 9880259561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9880259561 = 809 ⋅12212929.

It can be written as a sum of positive squares in 2 ways, for example, as 413430889 + 1246090000 = 20333^2 + 35300^2 .

It is a cyclic number.

It is not a de Polignac number, because 1659520889 - 2²⁰ = 1658472313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1659520889.

It is not an unprimeable number, because it can be changed into a prime (1659520829) 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 3 ways as a sum of consecutive naturals, for example, 63827714 + ... + 63827739.

It is an arithmetic number, because the mean of its divisors is an integer number (446794089).

Almost surely, 2^1659520889 is an apocalyptic number.

It is an amenable number.

1659520889 is a deficient number, since it is larger than the sum of its proper divisors (127655467).

1659520889 is a wasteful number, since it uses less digits than its factorization.

1659520889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127655466.

The product of its (nonzero) digits is 1555200, while the sum is 53.

The square root of 1659520889 is about 40737.2174921165. The cubic root of 1659520889 is about 1183.9342228284.

The spelling of 1659520889 in words is "one billion, six hundred fifty-nine million, five hundred twenty thousand, eight hundred eighty-nine".