16972517 has 2 divisors, whose sum is σ = 16972518. Its totient is φ = 16972516.

The previous prime is 16972489. The next prime is 16972541. The reversal of 16972517 is 71527961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9928801 + 7043716 = 3151^2 + 2654^2 .

It is an emirp because it is prime and its reverse (71527961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16972517 - 2¹² = 16968421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16972577) 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 as a sum of consecutive naturals, namely, 8486258 + 8486259.

It is an arithmetic number, because the mean of its divisors is an integer number (8486259).

Almost surely, 2^16972517 is an apocalyptic number.

It is an amenable number.

16972517 is a deficient number, since it is larger than the sum of its proper divisors (1).

16972517 is an equidigital number, since it uses as much as digits as its factorization.

16972517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 38.

The square root of 16972517 is about 4119.7714742447. The cubic root of 16972517 is about 256.9895225028.

The spelling of 16972517 in words is "sixteen million, nine hundred seventy-two thousand, five hundred seventeen".