16564129 has 2 divisors, whose sum is σ = 16564130. Its totient is φ = 16564128.

The previous prime is 16564127. The next prime is 16564157. The reversal of 16564129 is 92146561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16443025 + 121104 = 4055^2 + 348^2 .

It is a cyclic number.

It is not a de Polignac number, because 16564129 - 2¹ = 16564127 is a prime.

Together with 16564127, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 16564094 and 16564103.

It is not a weakly prime, because it can be changed into another prime (16564127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8282064 + 8282065.

It is an arithmetic number, because the mean of its divisors is an integer number (8282065).

Almost surely, 2^16564129 is an apocalyptic number.

It is an amenable number.

16564129 is a deficient number, since it is larger than the sum of its proper divisors (1).

16564129 is an equidigital number, since it uses as much as digits as its factorization.

16564129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The square root of 16564129 is about 4069.9052814531. The cubic root of 16564129 is about 254.9115623091.

The spelling of 16564129 in words is "sixteen million, five hundred sixty-four thousand, one hundred twenty-nine".