16973581 has 2 divisors, whose sum is σ = 16973582. Its totient is φ = 16973580.

The previous prime is 16973573. The next prime is 16973587. The reversal of 16973581 is 18537961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11526025 + 5447556 = 3395^2 + 2334^2 .

It is a cyclic number.

It is not a de Polignac number, because 16973581 - 2³ = 16973573 is a prime.

It is a super-2 number, since 2×16973581² = 576204903927122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16973587) 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, 8486790 + 8486791.

It is an arithmetic number, because the mean of its divisors is an integer number (8486791).

Almost surely, 2^16973581 is an apocalyptic number.

It is an amenable number.

16973581 is a deficient number, since it is larger than the sum of its proper divisors (1).

16973581 is an equidigital number, since it uses as much as digits as its factorization.

16973581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The square root of 16973581 is about 4119.9006055972. The cubic root of 16973581 is about 256.9948925792.

The spelling of 16973581 in words is "sixteen million, nine hundred seventy-three thousand, five hundred eighty-one".