18985069 has 2 divisors, whose sum is σ = 18985070. Its totient is φ = 18985068.

The previous prime is 18985027. The next prime is 18985081. The reversal of 18985069 is 96058981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18966025 + 19044 = 4355^2 + 138^2 .

It is an emirp because it is prime and its reverse (96058981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18985069 - 2⁷ = 18984941 is a prime.

It is a super-2 number, since 2×18985069² = 720865689869522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18985969) 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, 9492534 + 9492535.

It is an arithmetic number, because the mean of its divisors is an integer number (9492535).

Almost surely, 2^18985069 is an apocalyptic number.

It is an amenable number.

18985069 is a deficient number, since it is larger than the sum of its proper divisors (1).

18985069 is an equidigital number, since it uses as much as digits as its factorization.

18985069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 18985069 is about 4357.1859037686. The cubic root of 18985069 is about 266.7702484756.

It can be divided in two parts, 189 and 85069, that added together give a palindrome (85258).

The spelling of 18985069 in words is "eighteen million, nine hundred eighty-five thousand, sixty-nine".