8561998 has 4 divisors (see below), whose sum is σ = 12843000. Its totient is φ = 4280998.

The previous prime is 8561963. The next prime is 8562023. The reversal of 8561998 is 8991658.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2140498 + ... + 2140501.

It is an arithmetic number, because the mean of its divisors is an integer number (3210750).

Almost surely, 2^8561998 is an apocalyptic number.

8561998 is a deficient number, since it is larger than the sum of its proper divisors (4281002).

8561998 is a wasteful number, since it uses less digits than its factorization.

8561998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4281001.

The product of its digits is 155520, while the sum is 46.

The square root of 8561998 is about 2926.0891989138. The cubic root of 8561998 is about 204.5777387904.

It can be divided in two parts, 8561 and 998, that added together give a palindrome (9559).

The spelling of 8561998 in words is "eight million, five hundred sixty-one thousand, nine hundred ninety-eight".