16106561 has 2 divisors, whose sum is σ = 16106562. Its totient is φ = 16106560.

The previous prime is 16106539. The next prime is 16106579. The reversal of 16106561 is 16560161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11458225 + 4648336 = 3385^2 + 2156^2 .

It is a cyclic number.

It is not a de Polignac number, because 16106561 - 2¹⁸ = 15844417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16106561.

It is not a weakly prime, because it can be changed into another prime (16106261) 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, 8053280 + 8053281.

It is an arithmetic number, because the mean of its divisors is an integer number (8053281).

Almost surely, 2^16106561 is an apocalyptic number.

It is an amenable number.

16106561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16106561 is an equidigital number, since it uses as much as digits as its factorization.

16106561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 16106561 is about 4013.2980203319. The cubic root of 16106561 is about 252.5423828473.

The spelling of 16106561 in words is "sixteen million, one hundred six thousand, five hundred sixty-one".