11531539 has 2 divisors, whose sum is σ = 11531540. Its totient is φ = 11531538.

The previous prime is 11531521. The next prime is 11531543. The reversal of 11531539 is 93513511.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11531539 is a prime.

It is not a weakly prime, because it can be changed into another prime (11531519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5765769 + 5765770.

It is an arithmetic number, because the mean of its divisors is an integer number (5765770).

Almost surely, 2^11531539 is an apocalyptic number.

11531539 is a deficient number, since it is larger than the sum of its proper divisors (1).

11531539 is an equidigital number, since it uses as much as digits as its factorization.

11531539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2025, while the sum is 28.

The square root of 11531539 is about 3395.8119794830. The cubic root of 11531539 is about 225.9240288151.

The spelling of 11531539 in words is "eleven million, five hundred thirty-one thousand, five hundred thirty-nine".