1331221285 has 8 divisors (see below), whose sum is σ = 1608045696. Its totient is φ = 1057923600.

The previous prime is 1331221273. The next prime is 1331221289. The reversal of 1331221285 is 5821221331.

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

It is not a de Polignac number, because 1331221285 - 2²¹ = 1329124133 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 (1331221289) 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, 880849 + ... + 882358.

It is an arithmetic number, because the mean of its divisors is an integer number (201005712).

Almost surely, 2^1331221285 is an apocalyptic number.

It is an amenable number.

1331221285 is a deficient number, since it is larger than the sum of its proper divisors (276824411).

1331221285 is a wasteful number, since it uses less digits than its factorization.

1331221285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763363.

The product of its digits is 2880, while the sum is 28.

The square root of 1331221285 is about 36485.9052923180. The cubic root of 1331221285 is about 1100.0609566771.

The spelling of 1331221285 in words is "one billion, three hundred thirty-one million, two hundred twenty-one thousand, two hundred eighty-five".