16621459 has 2 divisors, whose sum is σ = 16621460. Its totient is φ = 16621458.

The previous prime is 16621457. The next prime is 16621477. The reversal of 16621459 is 95412661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16621459 - 2¹ = 16621457 is a prime.

Together with 16621457, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16621453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8310729 + 8310730.

It is an arithmetic number, because the mean of its divisors is an integer number (8310730).

Almost surely, 2^16621459 is an apocalyptic number.

16621459 is a deficient number, since it is larger than the sum of its proper divisors (1).

16621459 is an equidigital number, since it uses as much as digits as its factorization.

16621459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 16621459 is about 4076.9423591707. The cubic root of 16621459 is about 255.2053145891.

The spelling of 16621459 in words is "sixteen million, six hundred twenty-one thousand, four hundred fifty-nine".