16989197 has 4 divisors (see below), whose sum is σ = 17002560. Its totient is φ = 16975836.

The previous prime is 16989163. The next prime is 16989199. The reversal of 16989197 is 79198961.

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: 79198961 = 419 ⋅189019.

It is a cyclic number.

It is not a de Polignac number, because 16989197 - 2⁸ = 16988941 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 (16989199) 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, 4547 + ... + 7392.

It is an arithmetic number, because the mean of its divisors is an integer number (4250640).

Almost surely, 2^16989197 is an apocalyptic number.

It is an amenable number.

16989197 is a deficient number, since it is larger than the sum of its proper divisors (13363).

16989197 is a wasteful number, since it uses less digits than its factorization.

16989197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13362.

The product of its digits is 244944, while the sum is 50.

The square root of 16989197 is about 4121.7953612473. The cubic root of 16989197 is about 257.0736817304.

The spelling of 16989197 in words is "sixteen million, nine hundred eighty-nine thousand, one hundred ninety-seven".