8611989 has 4 divisors (see below), whose sum is σ = 11482656. Its totient is φ = 5741324.

The previous prime is 8611987. The next prime is 8611991. The reversal of 8611989 is 9891168.

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 an interprime number because it is at equal distance from previous prime (8611987) and next prime (8611991).

It is a cyclic number.

It is not a de Polignac number, because 8611989 - 2¹ = 8611987 is a prime.

It is a super-2 number, since 2×8611989² = 148332709072242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8611989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8611987) 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, 1435329 + ... + 1435334.

It is an arithmetic number, because the mean of its divisors is an integer number (2870664).

Almost surely, 2^8611989 is an apocalyptic number.

It is an amenable number.

8611989 is a deficient number, since it is larger than the sum of its proper divisors (2870667).

8611989 is a wasteful number, since it uses less digits than its factorization.

8611989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2870666.

The product of its digits is 31104, while the sum is 42.

The square root of 8611989 is about 2934.6190553460. The cubic root of 8611989 is about 204.9751228984.

It can be divided in two parts, 861 and 1989, that added together give a triangular number (2850 = T₇₅).

The spelling of 8611989 in words is "eight million, six hundred eleven thousand, nine hundred eighty-nine".