1280255221 has 4 divisors (see below), whose sum is σ = 1463148832. Its totient is φ = 1097361612.

The previous prime is 1280255213. The next prime is 1280255243. The reversal of 1280255221 is 1225520821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1280255221 - 2³ = 1280255213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1280255221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280255281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91446795 + ... + 91446808.

It is an arithmetic number, because the mean of its divisors is an integer number (365787208).

Almost surely, 2^1280255221 is an apocalyptic number.

It is an amenable number.

1280255221 is a deficient number, since it is larger than the sum of its proper divisors (182893611).

1280255221 is an equidigital number, since it uses as much as digits as its factorization.

1280255221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182893610.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 1280255221 is about 35780.6542841240. The cubic root of 1280255221 is about 1085.8392060483.

The spelling of 1280255221 in words is "one billion, two hundred eighty million, two hundred fifty-five thousand, two hundred twenty-one".