16624999 has 2 divisors, whose sum is σ = 16625000. Its totient is φ = 16624998.

The previous prime is 16624939. The next prime is 16625009. The reversal of 16624999 is 99942661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16624999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16624919) 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, 8312499 + 8312500.

It is an arithmetic number, because the mean of its divisors is an integer number (8312500).

Almost surely, 2^16624999 is an apocalyptic number.

16624999 is a deficient number, since it is larger than the sum of its proper divisors (1).

16624999 is an equidigital number, since it uses as much as digits as its factorization.

16624999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 46.

The square root of 16624999 is about 4077.3764849472. The cubic root of 16624999 is about 255.2234309828.

The spelling of 16624999 in words is "sixteen million, six hundred twenty-four thousand, nine hundred ninety-nine".