16489381 has 2 divisors, whose sum is σ = 16489382. Its totient is φ = 16489380.

The previous prime is 16489357. The next prime is 16489391. The reversal of 16489381 is 18398461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16273156 + 216225 = 4034^2 + 465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16489381 is a prime.

It is a super-2 number, since 2×16489381² = 543799371526322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16489391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8244690 + 8244691.

It is an arithmetic number, because the mean of its divisors is an integer number (8244691).

Almost surely, 2^16489381 is an apocalyptic number.

It is an amenable number.

16489381 is a deficient number, since it is larger than the sum of its proper divisors (1).

16489381 is an equidigital number, since it uses as much as digits as its factorization.

16489381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 16489381 is about 4060.7118834017. The cubic root of 16489381 is about 254.5275424587.

The spelling of 16489381 in words is "sixteen million, four hundred eighty-nine thousand, three hundred eighty-one".