16971243 has 4 divisors (see below), whose sum is σ = 22628328. Its totient is φ = 11314160.

The previous prime is 16971239. The next prime is 16971257. The reversal of 16971243 is 34217961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34217961 = 3 ⋅11405987.

It is a cyclic number.

It is not a de Polignac number, because 16971243 - 2² = 16971239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16971203) 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, 2828538 + ... + 2828543.

It is an arithmetic number, because the mean of its divisors is an integer number (5657082).

Almost surely, 2^16971243 is an apocalyptic number.

16971243 is a deficient number, since it is larger than the sum of its proper divisors (5657085).

16971243 is an equidigital number, since it uses as much as digits as its factorization.

16971243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5657084.

The product of its digits is 9072, while the sum is 33.

The square root of 16971243 is about 4119.6168511161. The cubic root of 16971243 is about 256.9830922477.

The spelling of 16971243 in words is "sixteen million, nine hundred seventy-one thousand, two hundred forty-three".