16801381 has 2 divisors, whose sum is σ = 16801382. Its totient is φ = 16801380.

The previous prime is 16801373. The next prime is 16801387. The reversal of 16801381 is 18310861.

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., 9150625 + 7650756 = 3025^2 + 2766^2 .

It is a cyclic number.

It is not a de Polignac number, because 16801381 - 2³ = 16801373 is a prime.

It is a super-2 number, since 2×16801381² = 564572807014322, 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 (16801387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8400690 + 8400691.

It is an arithmetic number, because the mean of its divisors is an integer number (8400691).

Almost surely, 2^16801381 is an apocalyptic number.

It is an amenable number.

16801381 is a deficient number, since it is larger than the sum of its proper divisors (1).

16801381 is an equidigital number, since it uses as much as digits as its factorization.

16801381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 16801381 is about 4098.9487676720. The cubic root of 16801381 is about 256.1228505823.

The spelling of 16801381 in words is "sixteen million, eight hundred one thousand, three hundred eighty-one".