155223227 has 2 divisors, whose sum is σ = 155223228. Its totient is φ = 155223226.

The previous prime is 155223221. The next prime is 155223259. The reversal of 155223227 is 722322551.

It is a weak prime.

It is an emirp because it is prime and its reverse (722322551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155223227 - 2¹² = 155219131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155223227.

It is not a weakly prime, because it can be changed into another prime (155223221) 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, 77611613 + 77611614.

It is an arithmetic number, because the mean of its divisors is an integer number (77611614).

Almost surely, 2^155223227 is an apocalyptic number.

155223227 is a deficient number, since it is larger than the sum of its proper divisors (1).

155223227 is an equidigital number, since it uses as much as digits as its factorization.

155223227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 29.

The square root of 155223227 is about 12458.8613845728. The cubic root of 155223227 is about 537.4262838873.

Adding to 155223227 its reverse (722322551), we get a palindrome (877545778).

The spelling of 155223227 in words is "one hundred fifty-five million, two hundred twenty-three thousand, two hundred twenty-seven".