55511311 has 2 divisors, whose sum is σ = 55511312. Its totient is φ = 55511310.

The previous prime is 55511303. The next prime is 55511321. The reversal of 55511311 is 11311555.

55511311 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55511311 - 2³ = 55511303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55511321) 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, 27755655 + 27755656.

It is an arithmetic number, because the mean of its divisors is an integer number (27755656).

Almost surely, 2^55511311 is an apocalyptic number.

55511311 is a deficient number, since it is larger than the sum of its proper divisors (1).

55511311 is an equidigital number, since it uses as much as digits as its factorization.

55511311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 375, while the sum is 22.

The square root of 55511311 is about 7450.5913188149. The cubic root of 55511311 is about 381.4700925363.

Adding to 55511311 its reverse (11311555), we get a palindrome (66822866).

The spelling of 55511311 in words is "fifty-five million, five hundred eleven thousand, three hundred eleven".