16814381 has 2 divisors, whose sum is σ = 16814382. Its totient is φ = 16814380.

The previous prime is 16814363. The next prime is 16814393. The reversal of 16814381 is 18341861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8462281 + 8352100 = 2909^2 + 2890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16814381 is a prime.

It is a super-2 number, since 2×16814381² = 565446816826322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16814321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8407190 + 8407191.

It is an arithmetic number, because the mean of its divisors is an integer number (8407191).

Almost surely, 2^16814381 is an apocalyptic number.

It is an amenable number.

16814381 is a deficient number, since it is larger than the sum of its proper divisors (1).

16814381 is an equidigital number, since it uses as much as digits as its factorization.

16814381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 32.

The square root of 16814381 is about 4100.5342334871. The cubic root of 16814381 is about 256.1888915558.

The spelling of 16814381 in words is "sixteen million, eight hundred fourteen thousand, three hundred eighty-one".