1020200989 has 4 divisors (see below), whose sum is σ = 1020310624. Its totient is φ = 1020091356.

The previous prime is 1020200983. The next prime is 1020200999. The reversal of 1020200989 is 9890020201.

1020200989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9890020201 = 19 ⋅520527379.

It is a cyclic number.

It is not a de Polignac number, because 1020200989 - 2³ = 1020200981 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 1020200989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020200981) 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, 39417 + ... + 59950.

It is an arithmetic number, because the mean of its divisors is an integer number (255077656).

Almost surely, 2^1020200989 is an apocalyptic number.

It is an amenable number.

1020200989 is a deficient number, since it is larger than the sum of its proper divisors (109635).

1020200989 is an equidigital number, since it uses as much as digits as its factorization.

1020200989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109634.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1020200989 is about 31940.5852952008. The cubic root of 1020200989 is about 1006.6888228949.

The spelling of 1020200989 in words is "one billion, twenty million, two hundred thousand, nine hundred eighty-nine".