16624891 has 2 divisors, whose sum is σ = 16624892. Its totient is φ = 16624890.

The previous prime is 16624889. The next prime is 16624913. The reversal of 16624891 is 19842661.

It is a happy number.

16624891 is nontrivially palindromic in base 15.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16624891 - 2¹ = 16624889 is a prime.

Together with 16624889, it forms a pair of twin primes.

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 16624891.

It is not a weakly prime, because it can be changed into another prime (16624841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8312445 + 8312446.

It is an arithmetic number, because the mean of its divisors is an integer number (8312446).

Almost surely, 2^16624891 is an apocalyptic number.

16624891 is a deficient number, since it is larger than the sum of its proper divisors (1).

16624891 is an equidigital number, since it uses as much as digits as its factorization.

16624891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 16624891 is about 4077.3632411155. The cubic root of 16624891 is about 255.2228783173. Note that the first 3 decimals are identical.

The spelling of 16624891 in words is "sixteen million, six hundred twenty-four thousand, eight hundred ninety-one".