16998493 has 2 divisors, whose sum is σ = 16998494. Its totient is φ = 16998492.

The previous prime is 16998481. The next prime is 16998497. The reversal of 16998493 is 39489961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16867449 + 131044 = 4107^2 + 362^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16998493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16998497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8499246 + 8499247.

It is an arithmetic number, because the mean of its divisors is an integer number (8499247).

Almost surely, 2^16998493 is an apocalyptic number.

It is an amenable number.

16998493 is a deficient number, since it is larger than the sum of its proper divisors (1).

16998493 is an equidigital number, since it uses as much as digits as its factorization.

16998493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 49.

The square root of 16998493 is about 4122.9228709739. The cubic root of 16998493 is about 257.1205609563.

The spelling of 16998493 in words is "sixteen million, nine hundred ninety-eight thousand, four hundred ninety-three".