1280297221 has 8 divisors (see below), whose sum is σ = 1463946944. Its totient is φ = 1096835040.

The previous prime is 1280297173. The next prime is 1280297237. The reversal of 1280297221 is 1227920821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1280297221 - 2²³ = 1271908613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280207221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31935 + ... + 59836.

It is an arithmetic number, because the mean of its divisors is an integer number (182993368).

Almost surely, 2^1280297221 is an apocalyptic number.

It is an amenable number.

1280297221 is a deficient number, since it is larger than the sum of its proper divisors (183649723).

1280297221 is an equidigital number, since it uses as much as digits as its factorization.

1280297221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93771.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 1280297221 is about 35781.2411886452. The cubic root of 1280297221 is about 1085.8510799172.

The spelling of 1280297221 in words is "one billion, two hundred eighty million, two hundred ninety-seven thousand, two hundred twenty-one".