5656181 has 2 divisors, whose sum is σ = 5656182. Its totient is φ = 5656180.

The previous prime is 5656171. The next prime is 5656193. The reversal of 5656181 is 1816565.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4906225 + 749956 = 2215^2 + 866^2 .

It is a cyclic number.

It is not a de Polignac number, because 5656181 - 2⁶ = 5656117 is a prime.

It is a super-2 number, since 2×5656181² = 63984767009522, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5656111) 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 as a sum of consecutive naturals, namely, 2828090 + 2828091.

It is an arithmetic number, because the mean of its divisors is an integer number (2828091).

Almost surely, 2^5656181 is an apocalyptic number.

It is an amenable number.

5656181 is a deficient number, since it is larger than the sum of its proper divisors (1).

5656181 is an equidigital number, since it uses as much as digits as its factorization.

5656181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 32.

The square root of 5656181 is about 2378.2726925229. The cubic root of 5656181 is about 178.1726746709.

The spelling of 5656181 in words is "five million, six hundred fifty-six thousand, one hundred eighty-one".