6681579 has 4 divisors (see below), whose sum is σ = 8908776. Its totient is φ = 4454384.

The previous prime is 6681557. The next prime is 6681581. The reversal of 6681579 is 9751866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6681579 - 2⁵ = 6681547 is a prime.

It is a D-number.

6681579 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6681579.

It is not an unprimeable number, because it can be changed into a prime (6681529) 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, 1113594 + ... + 1113599.

It is an arithmetic number, because the mean of its divisors is an integer number (2227194).

Almost surely, 2^6681579 is an apocalyptic number.

6681579 is a deficient number, since it is larger than the sum of its proper divisors (2227197).

6681579 is a wasteful number, since it uses less digits than its factorization.

6681579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227196.

The product of its digits is 90720, while the sum is 42.

The square root of 6681579 is about 2584.8750453358. The cubic root of 6681579 is about 188.3474317027.

It can be divided in two parts, 6681 and 579, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 6681579 in words is "six million, six hundred eighty-one thousand, five hundred seventy-nine".