6715561 has 8 divisors (see below), whose sum is σ = 7340544. Its totient is φ = 6116160.

The previous prime is 6715523. The next prime is 6715567. The reversal of 6715561 is 1655176.

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 6715561 - 2¹¹ = 6713513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

6715561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6715567) 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, 5845 + ... + 6898.

It is an arithmetic number, because the mean of its divisors is an integer number (917568).

Almost surely, 2^6715561 is an apocalyptic number.

It is an amenable number.

6715561 is a deficient number, since it is larger than the sum of its proper divisors (624983).

6715561 is a wasteful number, since it uses less digits than its factorization.

6715561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12791.

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

The square root of 6715561 is about 2591.4399472108. The cubic root of 6715561 is about 188.6661987832. Note that the first 3 decimals are identical.

The spelling of 6715561 in words is "six million, seven hundred fifteen thousand, five hundred sixty-one".