6861563 has 4 divisors (see below), whose sum is σ = 6866880. Its totient is φ = 6856248.

The previous prime is 6861559. The next prime is 6861581. The reversal of 6861563 is 3651686.

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 6861563 - 2² = 6861559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6861583) 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, 653 + ... + 3761.

It is an arithmetic number, because the mean of its divisors is an integer number (1716720).

Almost surely, 2^6861563 is an apocalyptic number.

6861563 is a deficient number, since it is larger than the sum of its proper divisors (5317).

6861563 is a wasteful number, since it uses less digits than its factorization.

6861563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5316.

The product of its digits is 25920, while the sum is 35.

The square root of 6861563 is about 2619.4585318344. The cubic root of 6861563 is about 190.0236627962.

The spelling of 6861563 in words is "six million, eight hundred sixty-one thousand, five hundred sixty-three".