1255884221 has 2 divisors, whose sum is σ = 1255884222. Its totient is φ = 1255884220.

The previous prime is 1255884199. The next prime is 1255884277. The reversal of 1255884221 is 1224885521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 668791321 + 587092900 = 25861^2 + 24230^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255884221 - 2¹⁰ = 1255883197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255883221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627942110 + 627942111.

It is an arithmetic number, because the mean of its divisors is an integer number (627942111).

Almost surely, 2^1255884221 is an apocalyptic number.

It is an amenable number.

1255884221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255884221 is an equidigital number, since it uses as much as digits as its factorization.

1255884221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51200, while the sum is 38.

The square root of 1255884221 is about 35438.4568089526. The cubic root of 1255884221 is about 1078.9049889671.

The spelling of 1255884221 in words is "one billion, two hundred fifty-five million, eight hundred eighty-four thousand, two hundred twenty-one".