16637987 has 2 divisors, whose sum is σ = 16637988. Its totient is φ = 16637986.

The previous prime is 16637969. The next prime is 16637989. The reversal of 16637987 is 78973661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16637987 - 2¹⁴ = 16621603 is a prime.

It is a super-2 number, since 2×16637987² = 553645222824338, which contains 22 as substring.

Together with 16637989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16637989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8318993 + 8318994.

It is an arithmetic number, because the mean of its divisors is an integer number (8318994).

Almost surely, 2^16637987 is an apocalyptic number.

16637987 is a deficient number, since it is larger than the sum of its proper divisors (1).

16637987 is an equidigital number, since it uses as much as digits as its factorization.

16637987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 47.

The square root of 16637987 is about 4078.9688647990. The cubic root of 16637987 is about 255.2898766825.

The spelling of 16637987 in words is "sixteen million, six hundred thirty-seven thousand, nine hundred eighty-seven".