16064561 has 2 divisors, whose sum is σ = 16064562. Its totient is φ = 16064560.

The previous prime is 16064539. The next prime is 16064569. The reversal of 16064561 is 16546061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14776336 + 1288225 = 3844^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 16064561 - 2¹⁸ = 15802417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16064569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8032280 + 8032281.

It is an arithmetic number, because the mean of its divisors is an integer number (8032281).

Almost surely, 2^16064561 is an apocalyptic number.

It is an amenable number.

16064561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16064561 is an equidigital number, since it uses as much as digits as its factorization.

16064561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 16064561 is about 4008.0620005185. The cubic root of 16064561 is about 252.3226791504.

The spelling of 16064561 in words is "sixteen million, sixty-four thousand, five hundred sixty-one".