16975921 has 2 divisors, whose sum is σ = 16975922. Its totient is φ = 16975920.

The previous prime is 16975913. The next prime is 16975957. The reversal of 16975921 is 12957961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16974400 + 1521 = 4120^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 16975921 - 2³ = 16975913 is a prime.

It is not a weakly prime, because it can be changed into another prime (16955921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8487960 + 8487961.

It is an arithmetic number, because the mean of its divisors is an integer number (8487961).

Almost surely, 2^16975921 is an apocalyptic number.

It is an amenable number.

16975921 is a deficient number, since it is larger than the sum of its proper divisors (1).

16975921 is an equidigital number, since it uses as much as digits as its factorization.

16975921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 40.

The square root of 16975921 is about 4120.1845832438. The cubic root of 16975921 is about 257.0067019201.

The spelling of 16975921 in words is "sixteen million, nine hundred seventy-five thousand, nine hundred twenty-one".