16603997 has 2 divisors, whose sum is σ = 16603998. Its totient is φ = 16603996.

The previous prime is 16603991. The next prime is 16604023. The reversal of 16603997 is 79930661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10621081 + 5982916 = 3259^2 + 2446^2 .

It is an emirp because it is prime and its reverse (79930661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16603997 - 2⁴ = 16603981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16603991) 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, 8301998 + 8301999.

It is an arithmetic number, because the mean of its divisors is an integer number (8301999).

Almost surely, 2^16603997 is an apocalyptic number.

It is an amenable number.

16603997 is a deficient number, since it is larger than the sum of its proper divisors (1).

16603997 is an equidigital number, since it uses as much as digits as its factorization.

16603997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 16603997 is about 4074.8002405026. The cubic root of 16603997 is about 255.1159129568.

The spelling of 16603997 in words is "sixteen million, six hundred three thousand, nine hundred ninety-seven".