16595561 has 2 divisors, whose sum is σ = 16595562. Its totient is φ = 16595560.

The previous prime is 16595543. The next prime is 16595567. The reversal of 16595561 is 16559561.

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., 15840400 + 755161 = 3980^2 + 869^2 .

It is an emirp because it is prime and its reverse (16559561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16595561 is a prime.

It is not a weakly prime, because it can be changed into another prime (16595567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8297780 + 8297781.

It is an arithmetic number, because the mean of its divisors is an integer number (8297781).

Almost surely, 2^16595561 is an apocalyptic number.

It is an amenable number.

16595561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16595561 is an equidigital number, since it uses as much as digits as its factorization.

16595561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40500, while the sum is 38.

The square root of 16595561 is about 4073.7649662198. The cubic root of 16595561 is about 255.0727000198.

The spelling of 16595561 in words is "sixteen million, five hundred ninety-five thousand, five hundred sixty-one".