55771223 has 2 divisors, whose sum is σ = 55771224. Its totient is φ = 55771222.

The previous prime is 55771189. The next prime is 55771229. The reversal of 55771223 is 32217755.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55771223 - 2¹⁶ = 55705687 is a prime.

It is a super-2 number, since 2×55771223² = 6220858629831458, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55771223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55771229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27885611 + 27885612.

It is an arithmetic number, because the mean of its divisors is an integer number (27885612).

Almost surely, 2^55771223 is an apocalyptic number.

55771223 is a deficient number, since it is larger than the sum of its proper divisors (1).

55771223 is an equidigital number, since it uses as much as digits as its factorization.

55771223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14700, while the sum is 32.

The square root of 55771223 is about 7468.0133235018. The cubic root of 55771223 is about 382.0645318279.

Adding to 55771223 its reverse (32217755), we get a palindrome (87988978).

The spelling of 55771223 in words is "fifty-five million, seven hundred seventy-one thousand, two hundred twenty-three".