989967571 has 4 divisors (see below), whose sum is σ = 990051712. Its totient is φ = 989883432.

The previous prime is 989967569. The next prime is 989967581. The reversal of 989967571 is 175769989.

989967571 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 brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 989967571 - 2¹ = 989967569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989967551) 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, 20856 + ... + 49141.

It is an arithmetic number, because the mean of its divisors is an integer number (247512928).

Almost surely, 2^989967571 is an apocalyptic number.

989967571 is a deficient number, since it is larger than the sum of its proper divisors (84141).

989967571 is a wasteful number, since it uses less digits than its factorization.

989967571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84140.

The product of its digits is 8573040, while the sum is 61.

The square root of 989967571 is about 31463.7501102459. The cubic root of 989967571 is about 996.6446109567.

The spelling of 989967571 in words is "nine hundred eighty-nine million, nine hundred sixty-seven thousand, five hundred seventy-one".