6388561 has 4 divisors (see below), whose sum is σ = 6393712. Its totient is φ = 6383412.

The previous prime is 6388559. The next prime is 6388597. The reversal of 6388561 is 1658836.

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, 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 6388561 - 2¹ = 6388559 is a prime.

It is an Ulam number.

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 6388561.

It is not an unprimeable number, because it can be changed into a prime (6388061) 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, 550 + ... + 3616.

It is an arithmetic number, because the mean of its divisors is an integer number (1598428).

Almost surely, 2^6388561 is an apocalyptic number.

It is an amenable number.

6388561 is a deficient number, since it is larger than the sum of its proper divisors (5151).

6388561 is a wasteful number, since it uses less digits than its factorization.

6388561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5150.

The product of its digits is 34560, while the sum is 37.

The square root of 6388561 is about 2527.5602861257. The cubic root of 6388561 is about 185.5528725128.

The spelling of 6388561 in words is "six million, three hundred eighty-eight thousand, five hundred sixty-one".