16938917 has 2 divisors, whose sum is σ = 16938918. Its totient is φ = 16938916.

The previous prime is 16938893. The next prime is 16938931. The reversal of 16938917 is 71983961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11621281 + 5317636 = 3409^2 + 2306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16938917 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 (16938997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8469458 + 8469459.

It is an arithmetic number, because the mean of its divisors is an integer number (8469459).

Almost surely, 2^16938917 is an apocalyptic number.

It is an amenable number.

16938917 is a deficient number, since it is larger than the sum of its proper divisors (1).

16938917 is an equidigital number, since it uses as much as digits as its factorization.

16938917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 16938917 is about 4115.6915579280. The cubic root of 16938917 is about 256.8198255689.

The spelling of 16938917 in words is "sixteen million, nine hundred thirty-eight thousand, nine hundred seventeen".