16424561 has 2 divisors, whose sum is σ = 16424562. Its totient is φ = 16424560.

The previous prime is 16424557. The next prime is 16424563. The reversal of 16424561 is 16542461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8410000 + 8014561 = 2900^2 + 2831^2 .

It is a cyclic number.

It is not a de Polignac number, because 16424561 - 2² = 16424557 is a prime.

Together with 16424563, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (16424563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8212280 + 8212281.

It is an arithmetic number, because the mean of its divisors is an integer number (8212281).

Almost surely, 2^16424561 is an apocalyptic number.

It is an amenable number.

16424561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16424561 is an equidigital number, since it uses as much as digits as its factorization.

16424561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 29.

The square root of 16424561 is about 4052.7226650734. The cubic root of 16424561 is about 254.1935873065.

It can be divided in two parts, 16 and 424561, that multiplied together give a palindrome (6792976).

The spelling of 16424561 in words is "sixteen million, four hundred twenty-four thousand, five hundred sixty-one".