16791997 has 4 divisors (see below), whose sum is σ = 17028576. Its totient is φ = 16555420.

The previous prime is 16791967. The next prime is 16792021. The reversal of 16791997 is 79919761.

It is a happy number.

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-16791997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16791997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16791917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118183 + ... + 118324.

It is an arithmetic number, because the mean of its divisors is an integer number (4257144).

Almost surely, 2^16791997 is an apocalyptic number.

It is an amenable number.

16791997 is a deficient number, since it is larger than the sum of its proper divisors (236579).

16791997 is an equidigital number, since it uses as much as digits as its factorization.

16791997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236578.

The product of its digits is 214326, while the sum is 49.

The square root of 16791997 is about 4097.8039240549. The cubic root of 16791997 is about 256.0751579862.

The spelling of 16791997 in words is "sixteen million, seven hundred ninety-one thousand, nine hundred ninety-seven".