16631969 has 4 divisors (see below), whose sum is σ = 16685760. Its totient is φ = 16578180.

The previous prime is 16631959. The next prime is 16631977. The reversal of 16631969 is 96913661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16631969 is a prime.

It is a super-2 number, since 2×16631969² = 553244785633922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16631929) 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 in 3 ways as a sum of consecutive naturals, for example, 26429 + ... + 27050.

It is an arithmetic number, because the mean of its divisors is an integer number (4171440).

Almost surely, 2^16631969 is an apocalyptic number.

It is an amenable number.

16631969 is a deficient number, since it is larger than the sum of its proper divisors (53791).

16631969 is an equidigital number, since it uses as much as digits as its factorization.

16631969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53790.

The product of its digits is 52488, while the sum is 41.

The square root of 16631969 is about 4078.2311116463. The cubic root of 16631969 is about 255.2590933162.

The spelling of 16631969 in words is "sixteen million, six hundred thirty-one thousand, nine hundred sixty-nine".