11690561 has 2 divisors, whose sum is σ = 11690562. Its totient is φ = 11690560.

The previous prime is 11690551. The next prime is 11690563. The reversal of 11690561 is 16509611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10627600 + 1062961 = 3260^2 + 1031^2 .

It is an emirp because it is prime and its reverse (16509611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11690561 - 2¹⁰ = 11689537 is a prime.

Together with 11690563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11690563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5845280 + 5845281.

It is an arithmetic number, because the mean of its divisors is an integer number (5845281).

Almost surely, 2^11690561 is an apocalyptic number.

It is an amenable number.

11690561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11690561 is an equidigital number, since it uses as much as digits as its factorization.

11690561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 11690561 is about 3419.1462384636. The cubic root of 11690561 is about 226.9578023214.

The spelling of 11690561 in words is "eleven million, six hundred ninety thousand, five hundred sixty-one".