6561587 has 8 divisors (see below), whose sum is σ = 6710880. Its totient is φ = 6413760.

The previous prime is 6561557. The next prime is 6561589. The reversal of 6561587 is 7851656.

It is a happy number.

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 6561587 - 2¹⁸ = 6299443 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 6561587.

It is not an unprimeable number, because it can be changed into a prime (6561589) 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, 15839 + ... + 16247.

It is an arithmetic number, because the mean of its divisors is an integer number (838860).

Almost surely, 2^6561587 is an apocalyptic number.

6561587 is a deficient number, since it is larger than the sum of its proper divisors (149293).

6561587 is a wasteful number, since it uses less digits than its factorization.

6561587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733.

The product of its digits is 50400, while the sum is 38.

The square root of 6561587 is about 2561.5594859382. The cubic root of 6561587 is about 187.2131269407.

The spelling of 6561587 in words is "six million, five hundred sixty-one thousand, five hundred eighty-seven".