11699561 has 2 divisors, whose sum is σ = 11699562. Its totient is φ = 11699560.

The previous prime is 11699551. The next prime is 11699563. The reversal of 11699561 is 16599611.

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., 11689561 + 10000 = 3419^2 + 100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11699561 is a prime.

Together with 11699563, 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 (11699563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5849780 + 5849781.

It is an arithmetic number, because the mean of its divisors is an integer number (5849781).

Almost surely, 2^11699561 is an apocalyptic number.

It is an amenable number.

11699561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11699561 is an equidigital number, since it uses as much as digits as its factorization.

11699561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 38.

The square root of 11699561 is about 3420.4621032837. The cubic root of 11699561 is about 227.0160286766.

The spelling of 11699561 in words is "eleven million, six hundred ninety-nine thousand, five hundred sixty-one".