8381561 has 8 divisors (see below), whose sum is σ = 8940960. Its totient is φ = 7829568.

The previous prime is 8381543. The next prime is 8381627. The reversal of 8381561 is 1651838.

8381561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8381561 - 2⁶ = 8381497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8381531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590 + ... + 4136.

It is an arithmetic number, because the mean of its divisors is an integer number (1117620).

Almost surely, 2^8381561 is an apocalyptic number.

It is an amenable number.

8381561 is a deficient number, since it is larger than the sum of its proper divisors (559399).

8381561 is a wasteful number, since it uses less digits than its factorization.

8381561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703.

The product of its digits is 5760, while the sum is 32.

The square root of 8381561 is about 2895.0925719224. The cubic root of 8381561 is about 203.1304216620.

The spelling of 8381561 in words is "eight million, three hundred eighty-one thousand, five hundred sixty-one".