989220863 has 4 divisors (see below), whose sum is σ = 1015956600. Its totient is φ = 962485128.

The previous prime is 989220853. The next prime is 989220887. The reversal of 989220863 is 368022989.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 989220863 - 2¹⁰ = 989219839 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989220833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13367813 + ... + 13367886.

It is an arithmetic number, because the mean of its divisors is an integer number (253989150).

Almost surely, 2^989220863 is an apocalyptic number.

989220863 is a deficient number, since it is larger than the sum of its proper divisors (26735737).

989220863 is a wasteful number, since it uses less digits than its factorization.

989220863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26735736.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 989220863 is about 31451.8817084129. The cubic root of 989220863 is about 996.3939664860.

The spelling of 989220863 in words is "nine hundred eighty-nine million, two hundred twenty thousand, eight hundred sixty-three".