1161539539 has 2 divisors, whose sum is σ = 1161539540. Its totient is φ = 1161539538.

The previous prime is 1161539503. The next prime is 1161539563. The reversal of 1161539539 is 9359351611.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161539539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1161539495 and 1161539504.

It is not a weakly prime, because it can be changed into another prime (1161539839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580769769 + 580769770.

It is an arithmetic number, because the mean of its divisors is an integer number (580769770).

Almost surely, 2^1161539539 is an apocalyptic number.

1161539539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161539539 is an equidigital number, since it uses as much as digits as its factorization.

1161539539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 109350, while the sum is 43.

The square root of 1161539539 is about 34081.3664485449. The cubic root of 1161539539 is about 1051.1822025393.

The spelling of 1161539539 in words is "one billion, one hundred sixty-one million, five hundred thirty-nine thousand, five hundred thirty-nine".