56581211 has 2 divisors, whose sum is σ = 56581212. Its totient is φ = 56581210.

The previous prime is 56581193. The next prime is 56581223. The reversal of 56581211 is 11218565.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56581211 is a prime.

It is not a weakly prime, because it can be changed into another prime (56581241) 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 as a sum of consecutive naturals, namely, 28290605 + 28290606.

It is an arithmetic number, because the mean of its divisors is an integer number (28290606).

Almost surely, 2^56581211 is an apocalyptic number.

56581211 is a deficient number, since it is larger than the sum of its proper divisors (1).

56581211 is an equidigital number, since it uses as much as digits as its factorization.

56581211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 29.

The square root of 56581211 is about 7522.0483247584. The cubic root of 56581211 is about 383.9052749388.

Adding to 56581211 its reverse (11218565), we get a palindrome (67799776).

The spelling of 56581211 in words is "fifty-six million, five hundred eighty-one thousand, two hundred eleven".