11565913 has 2 divisors, whose sum is σ = 11565914. Its totient is φ = 11565912.

The previous prime is 11565907. The next prime is 11565923. The reversal of 11565913 is 31956511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8020224 + 3545689 = 2832^2 + 1883^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11565913 is a prime.

It is not a weakly prime, because it can be changed into another prime (11565923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5782956 + 5782957.

It is an arithmetic number, because the mean of its divisors is an integer number (5782957).

Almost surely, 2^11565913 is an apocalyptic number.

It is an amenable number.

11565913 is a deficient number, since it is larger than the sum of its proper divisors (1).

11565913 is an equidigital number, since it uses as much as digits as its factorization.

11565913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050, while the sum is 31.

The square root of 11565913 is about 3400.8694476560. The cubic root of 11565913 is about 226.1482893968.

The spelling of 11565913 in words is "eleven million, five hundred sixty-five thousand, nine hundred thirteen".