16717997 has 4 divisors (see below), whose sum is σ = 16752000. Its totient is φ = 16683996.

The previous prime is 16717991. The next prime is 16717999. The reversal of 16717997 is 79971761.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79971761 = 1033 ⋅77417.

It is a cyclic number.

It is not a de Polignac number, because 16717997 - 2⁶ = 16717933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16717991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16253 + ... + 17250.

It is an arithmetic number, because the mean of its divisors is an integer number (4188000).

Almost surely, 2^16717997 is an apocalyptic number.

It is an amenable number.

16717997 is a deficient number, since it is larger than the sum of its proper divisors (34003).

16717997 is an equidigital number, since it uses as much as digits as its factorization.

16717997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34002.

The product of its digits is 166698, while the sum is 47.

The square root of 16717997 is about 4088.7647278854. The cubic root of 16717997 is about 255.6984415049.

The spelling of 16717997 in words is "sixteen million, seven hundred seventeen thousand, nine hundred ninety-seven".