8561993 has 4 divisors (see below), whose sum is σ = 9340368. Its totient is φ = 7783620.

The previous prime is 8561963. The next prime is 8562023. The reversal of 8561993 is 3991658.

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 (8561963) and next prime (8562023).

It is a cyclic number.

It is not a de Polignac number, because 8561993 - 2⁸ = 8561737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8561993.

It is not an unprimeable number, because it can be changed into a prime (8561953) 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, 389171 + ... + 389192.

It is an arithmetic number, because the mean of its divisors is an integer number (2335092).

Almost surely, 2^8561993 is an apocalyptic number.

It is an amenable number.

8561993 is a deficient number, since it is larger than the sum of its proper divisors (778375).

8561993 is a wasteful number, since it uses less digits than its factorization.

8561993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778374.

The product of its digits is 58320, while the sum is 41.

The square root of 8561993 is about 2926.0883445310. The cubic root of 8561993 is about 204.5776989676.

It can be divided in two parts, 8 and 561993, that multiplied together give a palindrome (4495944).

The spelling of 8561993 in words is "eight million, five hundred sixty-one thousand, nine hundred ninety-three".