16992881 has 2 divisors, whose sum is σ = 16992882. Its totient is φ = 16992880.

The previous prime is 16992863. The next prime is 16992893. The reversal of 16992881 is 18829961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12666481 + 4326400 = 3559^2 + 2080^2 .

It is a cyclic number.

It is not a de Polignac number, because 16992881 - 2⁶ = 16992817 is a prime.

It is a super-2 number, since 2×16992881² = 577516009360322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16992841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8496440 + 8496441.

It is an arithmetic number, because the mean of its divisors is an integer number (8496441).

Almost surely, 2^16992881 is an apocalyptic number.

It is an amenable number.

16992881 is a deficient number, since it is larger than the sum of its proper divisors (1).

16992881 is an equidigital number, since it uses as much as digits as its factorization.

16992881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 44.

The square root of 16992881 is about 4122.2422296609. The cubic root of 16992881 is about 257.0922619886.

The spelling of 16992881 in words is "sixteen million, nine hundred ninety-two thousand, eight hundred eighty-one".