255156221 has 2 divisors, whose sum is σ = 255156222. Its totient is φ = 255156220.

The previous prime is 255156217. The next prime is 255156271. The reversal of 255156221 is 122651552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134815321 + 120340900 = 11611^2 + 10970^2 .

It is a cyclic number.

It is not a de Polignac number, because 255156221 - 2² = 255156217 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255156211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127578110 + 127578111.

It is an arithmetic number, because the mean of its divisors is an integer number (127578111).

Almost surely, 2^255156221 is an apocalyptic number.

It is an amenable number.

255156221 is a deficient number, since it is larger than the sum of its proper divisors (1).

255156221 is an equidigital number, since it uses as much as digits as its factorization.

255156221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6000, while the sum is 29.

The square root of 255156221 is about 15973.6101429827. The cubic root of 255156221 is about 634.2620406053.

The spelling of 255156221 in words is "two hundred fifty-five million, one hundred fifty-six thousand, two hundred twenty-one".