16839881 has 2 divisors, whose sum is σ = 16839882. Its totient is φ = 16839880.

The previous prime is 16839863. The next prime is 16839883. The reversal of 16839881 is 18893861.

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., 16605625 + 234256 = 4075^2 + 484^2 .

It is a cyclic number.

It is not a de Polignac number, because 16839881 - 2⁶ = 16839817 is a prime.

It is a super-2 number, since 2×16839881² = 567163184188322, which contains 22 as substring.

Together with 16839883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16839883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8419940 + 8419941.

It is an arithmetic number, because the mean of its divisors is an integer number (8419941).

Almost surely, 2^16839881 is an apocalyptic number.

It is an amenable number.

16839881 is a deficient number, since it is larger than the sum of its proper divisors (1).

16839881 is an equidigital number, since it uses as much as digits as its factorization.

16839881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 44.

The square root of 16839881 is about 4103.6424064482. The cubic root of 16839881 is about 256.3183346606.

The spelling of 16839881 in words is "sixteen million, eight hundred thirty-nine thousand, eight hundred eighty-one".