18985451 has 2 divisors, whose sum is σ = 18985452. Its totient is φ = 18985450.

The previous prime is 18985441. The next prime is 18985513. The reversal of 18985451 is 15458981.

It is a weak prime.

It is an emirp because it is prime and its reverse (15458981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18985451 - 2⁶ = 18985387 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18985399 and 18985408.

It is not a weakly prime, because it can be changed into another prime (18985441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9492725 + 9492726.

It is an arithmetic number, because the mean of its divisors is an integer number (9492726).

Almost surely, 2^18985451 is an apocalyptic number.

18985451 is a deficient number, since it is larger than the sum of its proper divisors (1).

18985451 is an equidigital number, since it uses as much as digits as its factorization.

18985451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57600, while the sum is 41.

The square root of 18985451 is about 4357.2297391806. The cubic root of 18985451 is about 266.7720376983.

The spelling of 18985451 in words is "eighteen million, nine hundred eighty-five thousand, four hundred fifty-one".