16624161 has 6 divisors (see below), whose sum is σ = 24012690. Its totient is φ = 11082768.

The previous prime is 16624133. The next prime is 16624177. The reversal of 16624161 is 16142661.

It can be written as a sum of positive squares in only one way, i.e., 16160400 + 463761 = 4020^2 + 681^2 .

It is not a de Polignac number, because 16624161 - 2⁵ = 16624129 is a prime.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16624061) 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 in 5 ways as a sum of consecutive naturals, for example, 923556 + ... + 923573.

It is an arithmetic number, because the mean of its divisors is an integer number (4002115).

Almost surely, 2^16624161 is an apocalyptic number.

It is an amenable number.

16624161 is a deficient number, since it is larger than the sum of its proper divisors (7388529).

16624161 is a wasteful number, since it uses less digits than its factorization.

16624161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847135 (or 1847132 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 16624161 is about 4077.2737214958. The cubic root of 16624161 is about 255.2191426451.

The spelling of 16624161 in words is "sixteen million, six hundred twenty-four thousand, one hundred sixty-one".