16619959 has 2 divisors, whose sum is σ = 16619960. Its totient is φ = 16619958.

The previous prime is 16619957. The next prime is 16620001. The reversal of 16619959 is 95991661.

It is a weak prime.

It is an emirp because it is prime and its reverse (95991661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16619959 - 2¹ = 16619957 is a prime.

Together with 16619957, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16619957) 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, 8309979 + 8309980.

It is an arithmetic number, because the mean of its divisors is an integer number (8309980).

Almost surely, 2^16619959 is an apocalyptic number.

16619959 is a deficient number, since it is larger than the sum of its proper divisors (1).

16619959 is an equidigital number, since it uses as much as digits as its factorization.

16619959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131220, while the sum is 46.

The square root of 16619959 is about 4076.7583936260. The cubic root of 16619959 is about 255.1976373752.

It can be divided in two parts, 16619 and 959, that added together give a triangular number (17578 = T₁₈₇).

The spelling of 16619959 in words is "sixteen million, six hundred nineteen thousand, nine hundred fifty-nine".