16890481 has 2 divisors, whose sum is σ = 16890482. Its totient is φ = 16890480.

The previous prime is 16890479. The next prime is 16890493. The reversal of 16890481 is 18409861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9000000 + 7890481 = 3000^2 + 2809^2 .

It is a cyclic number.

It is not a de Polignac number, because 16890481 - 2¹ = 16890479 is a prime.

It is a super-2 number, since 2×16890481² = 570576696822722, which contains 22 as substring.

Together with 16890479, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16890481.

It is not a weakly prime, because it can be changed into another prime (16890421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8445240 + 8445241.

It is an arithmetic number, because the mean of its divisors is an integer number (8445241).

Almost surely, 2^16890481 is an apocalyptic number.

It is an amenable number.

16890481 is a deficient number, since it is larger than the sum of its proper divisors (1).

16890481 is an equidigital number, since it uses as much as digits as its factorization.

16890481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 16890481 is about 4109.8030366430. The cubic root of 16890481 is about 256.5748039915.

It can be divided in two parts, 16890 and 481, that added together give a palindrome (17371).

The spelling of 16890481 in words is "sixteen million, eight hundred ninety thousand, four hundred eighty-one".