1329981281 has 8 divisors (see below), whose sum is σ = 1408819464. Its totient is φ = 1251210240.

The previous prime is 1329981241. The next prime is 1329981337. The reversal of 1329981281 is 1821899231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 80712256 + 1249269025 = 8984^2 + 35345^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1329981281 is a prime.

It is a super-2 number, since 2×1329981281² = 3537700415620801922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1329981241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27341 + ... + 58373.

It is an arithmetic number, because the mean of its divisors is an integer number (176102433).

Almost surely, 2^1329981281 is an apocalyptic number.

It is an amenable number.

1329981281 is a deficient number, since it is larger than the sum of its proper divisors (78838183).

1329981281 is a wasteful number, since it uses less digits than its factorization.

1329981281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33571.

The product of its digits is 62208, while the sum is 44.

The square root of 1329981281 is about 36468.9084152515. The cubic root of 1329981281 is about 1099.7192895282.

The spelling of 1329981281 in words is "one billion, three hundred twenty-nine million, nine hundred eighty-one thousand, two hundred eighty-one".