5966581 has 4 divisors (see below), whose sum is σ = 6079212. Its totient is φ = 5853952.

The previous prime is 5966579. The next prime is 5966599. The reversal of 5966581 is 1856695.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1856695 = 5 ⋅371339.

It can be written as a sum of positive squares in 2 ways, for example, as 4100625 + 1865956 = 2025^2 + 1366^2 .

It is a cyclic number.

It is not a de Polignac number, because 5966581 - 2¹ = 5966579 is a prime.

It is a super-2 number, since 2×5966581² = 71200177659122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5966501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56236 + ... + 56341.

It is an arithmetic number, because the mean of its divisors is an integer number (1519803).

Almost surely, 2^5966581 is an apocalyptic number.

It is an amenable number.

5966581 is a deficient number, since it is larger than the sum of its proper divisors (112631).

5966581 is a wasteful number, since it uses less digits than its factorization.

5966581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112630.

The product of its digits is 64800, while the sum is 40.

The square root of 5966581 is about 2442.6585925995. The cubic root of 5966581 is about 181.3740623472.

The spelling of 5966581 in words is "five million, nine hundred sixty-six thousand, five hundred eighty-one".