18924881 has 2 divisors, whose sum is σ = 18924882. Its totient is φ = 18924880.

The previous prime is 18924877. The next prime is 18924923. The reversal of 18924881 is 18842981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18627856 + 297025 = 4316^2 + 545^2 .

It is an emirp because it is prime and its reverse (18842981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18924881 - 2² = 18924877 is a prime.

It is a super-3 number, since 3×18924881³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18924481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9462440 + 9462441.

It is an arithmetic number, because the mean of its divisors is an integer number (9462441).

Almost surely, 2^18924881 is an apocalyptic number.

It is an amenable number.

18924881 is a deficient number, since it is larger than the sum of its proper divisors (1).

18924881 is an equidigital number, since it uses as much as digits as its factorization.

18924881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 41.

The square root of 18924881 is about 4350.2736695523. The cubic root of 18924881 is about 266.4880378360.

The spelling of 18924881 in words is "eighteen million, nine hundred twenty-four thousand, eight hundred eighty-one".