981028589 has 4 divisors (see below), whose sum is σ = 981091740. Its totient is φ = 980965440.

The previous prime is 981028567. The next prime is 981028613. The reversal of 981028589 is 985820189.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 969263689 + 11764900 = 31133^2 + 3430^2 .

It is a cyclic number.

It is not a de Polignac number, because 981028589 - 2²⁰ = 979980013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981028549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9797 + ... + 45365.

It is an arithmetic number, because the mean of its divisors is an integer number (245272935).

Almost surely, 2^981028589 is an apocalyptic number.

It is an amenable number.

981028589 is a deficient number, since it is larger than the sum of its proper divisors (63151).

981028589 is a wasteful number, since it uses less digits than its factorization.

981028589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63150.

The product of its (nonzero) digits is 414720, while the sum is 50.

The square root of 981028589 is about 31321.3759116677. The cubic root of 981028589 is about 993.6357789477.

The spelling of 981028589 in words is "nine hundred eighty-one million, twenty-eight thousand, five hundred eighty-nine".