16631289 has 12 divisors (see below), whose sum is σ = 25287600. Its totient is φ = 10503864.

The previous prime is 16631269. The next prime is 16631311. The reversal of 16631289 is 98213661.

16631289 is a `hidden beast` number, since 16 + 631 + 2 + 8 + 9 = 666.

It is not a de Polignac number, because 16631289 - 2⁷ = 16631161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16631249) 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 in 11 ways as a sum of consecutive naturals, for example, 48459 + ... + 48800.

It is an arithmetic number, because the mean of its divisors is an integer number (2107300).

Almost surely, 2^16631289 is an apocalyptic number.

16631289 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16631289 is a deficient number, since it is larger than the sum of its proper divisors (8656311).

16631289 is a wasteful number, since it uses less digits than its factorization.

16631289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97284 (or 97281 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 16631289 is about 4078.1477413159. The cubic root of 16631289 is about 255.2556145028.

The spelling of 16631289 in words is "sixteen million, six hundred thirty-one thousand, two hundred eighty-nine".