1329481261 has 2 divisors, whose sum is σ = 1329481262. Its totient is φ = 1329481260.

The previous prime is 1329481253. The next prime is 1329481271. The reversal of 1329481261 is 1621849231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 991620100 + 337861161 = 31490^2 + 18381^2 .

It is a cyclic number.

It is not a de Polignac number, because 1329481261 - 2³ = 1329481253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1329481261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1329481271) 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 as a sum of consecutive naturals, namely, 664740630 + 664740631.

It is an arithmetic number, because the mean of its divisors is an integer number (664740631).

Almost surely, 2^1329481261 is an apocalyptic number.

It is an amenable number.

1329481261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1329481261 is an equidigital number, since it uses as much as digits as its factorization.

1329481261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 1329481261 is about 36462.0523421269. The cubic root of 1329481261 is about 1099.5814553666.

The spelling of 1329481261 in words is "one billion, three hundred twenty-nine million, four hundred eighty-one thousand, two hundred sixty-one".