16523641 has 2 divisors, whose sum is σ = 16523642. Its totient is φ = 16523640.

The previous prime is 16523629. The next prime is 16523657. The reversal of 16523641 is 14632561.

It is the 1660-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15093225 + 1430416 = 3885^2 + 1196^2 .

It is an emirp because it is prime and its reverse (14632561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16523641 - 2⁷ = 16523513 is a prime.

It is not a weakly prime, because it can be changed into another prime (16523681) 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, 8261820 + 8261821.

It is an arithmetic number, because the mean of its divisors is an integer number (8261821).

Almost surely, 2^16523641 is an apocalyptic number.

It is an amenable number.

16523641 is a deficient number, since it is larger than the sum of its proper divisors (1).

16523641 is an equidigital number, since it uses as much as digits as its factorization.

16523641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 16523641 is about 4064.9281666470. The cubic root of 16523641 is about 254.7036978745.

The spelling of 16523641 in words is "sixteen million, five hundred twenty-three thousand, six hundred forty-one".