1331229539 has 2 divisors, whose sum is σ = 1331229540. Its totient is φ = 1331229538.

The previous prime is 1331229527. The next prime is 1331229563. The reversal of 1331229539 is 9359221331.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331229539 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331229569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665614769 + 665614770.

It is an arithmetic number, because the mean of its divisors is an integer number (665614770).

Almost surely, 2^1331229539 is an apocalyptic number.

1331229539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331229539 is an equidigital number, since it uses as much as digits as its factorization.

1331229539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 38.

The square root of 1331229539 is about 36486.0184043148. The cubic root of 1331229539 is about 1100.0632302496.

The spelling of 1331229539 in words is "one billion, three hundred thirty-one million, two hundred twenty-nine thousand, five hundred thirty-nine".