11512561 has 2 divisors, whose sum is σ = 11512562. Its totient is φ = 11512560.

The previous prime is 11512547. The next prime is 11512573. The reversal of 11512561 is 16521511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6477025 + 5035536 = 2545^2 + 2244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11512561 is a prime.

It is not a weakly prime, because it can be changed into another prime (11512531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5756280 + 5756281.

It is an arithmetic number, because the mean of its divisors is an integer number (5756281).

Almost surely, 2^11512561 is an apocalyptic number.

It is an amenable number.

11512561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11512561 is an equidigital number, since it uses as much as digits as its factorization.

11512561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 300, while the sum is 22.

The square root of 11512561 is about 3393.0165045281. The cubic root of 11512561 is about 225.8000228038.

The spelling of 11512561 in words is "eleven million, five hundred twelve thousand, five hundred sixty-one".