6813561 has 16 divisors (see below), whose sum is σ = 9302400. Its totient is φ = 4435200.

The previous prime is 6813559. The next prime is 6813577. The reversal of 6813561 is 1653186.

It is not a de Polignac number, because 6813561 - 2¹ = 6813559 is a prime.

It is a super-2 number, since 2×6813561² = 92849227001442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6813511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34140 + ... + 34338.

It is an arithmetic number, because the mean of its divisors is an integer number (581400).

Almost surely, 2^6813561 is an apocalyptic number.

It is an amenable number.

6813561 is a deficient number, since it is larger than the sum of its proper divisors (2488839).

6813561 is a wasteful number, since it uses less digits than its factorization.

6813561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416.

The product of its digits is 4320, while the sum is 30.

The square root of 6813561 is about 2610.2798700523. The cubic root of 6813561 is about 189.5795040512.

The spelling of 6813561 in words is "six million, eight hundred thirteen thousand, five hundred sixty-one".