989547861 has 4 divisors (see below), whose sum is σ = 1319397152. Its totient is φ = 659698572.

The previous prime is 989547859. The next prime is 989547887. The reversal of 989547861 is 168745989.

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.

It is not a de Polignac number, because 989547861 - 2¹ = 989547859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989547821) 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, 164924641 + ... + 164924646.

It is an arithmetic number, because the mean of its divisors is an integer number (329849288).

Almost surely, 2^989547861 is an apocalyptic number.

It is an amenable number.

989547861 is a deficient number, since it is larger than the sum of its proper divisors (329849291).

989547861 is a wasteful number, since it uses less digits than its factorization.

989547861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329849290.

The product of its digits is 4354560, while the sum is 57.

The square root of 989547861 is about 31457.0796642028. The cubic root of 989547861 is about 996.5037441072.

The spelling of 989547861 in words is "nine hundred eighty-nine million, five hundred forty-seven thousand, eight hundred sixty-one".