16565401 has 2 divisors, whose sum is σ = 16565402. Its totient is φ = 16565400.

The previous prime is 16565347. The next prime is 16565407. The reversal of 16565401 is 10456561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14745600 + 1819801 = 3840^2 + 1349^2 .

It is a cyclic number.

It is not a de Polignac number, because 16565401 - 2¹¹ = 16563353 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16565401.

It is not a weakly prime, because it can be changed into another prime (16565407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8282700 + 8282701.

It is an arithmetic number, because the mean of its divisors is an integer number (8282701).

Almost surely, 2^16565401 is an apocalyptic number.

It is an amenable number.

16565401 is a deficient number, since it is larger than the sum of its proper divisors (1).

16565401 is an equidigital number, since it uses as much as digits as its factorization.

16565401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 16565401 is about 4070.0615474462. The cubic root of 16565401 is about 254.9180872363.

The spelling of 16565401 in words is "sixteen million, five hundred sixty-five thousand, four hundred one".