6561751 has 8 divisors (see below), whose sum is σ = 7602464. Its totient is φ = 5546880.

The previous prime is 6561721. The next prime is 6561761. The reversal of 6561751 is 1571656.

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 6561751 - 2⁵ = 6561719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561721) 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, 5910 + ... + 6931.

It is an arithmetic number, because the mean of its divisors is an integer number (950308).

Almost surely, 2^6561751 is an apocalyptic number.

6561751 is a deficient number, since it is larger than the sum of its proper divisors (1040713).

6561751 is a wasteful number, since it uses less digits than its factorization.

6561751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12921.

The product of its digits is 6300, while the sum is 31.

The square root of 6561751 is about 2561.5914974875. The cubic root of 6561751 is about 187.2146866597.

It can be divided in two parts, 65 and 61751, that added together give a palindrome (61816).

The spelling of 6561751 in words is "six million, five hundred sixty-one thousand, seven hundred fifty-one".