18942090269 has 2 divisors, whose sum is σ = 18942090270. Its totient is φ = 18942090268.

The previous prime is 18942090203. The next prime is 18942090281. The reversal of 18942090269 is 96209024981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12699036100 + 6243054169 = 112690^2 + 79013^2 .

It is an emirp because it is prime and its reverse (96209024981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18942090269 - 2¹² = 18942086173 is a prime.

It is a super-2 number, since 2×18942090269² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18942092269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9471045134 + 9471045135.

It is an arithmetic number, because the mean of its divisors is an integer number (9471045135).

Almost surely, 2^18942090269 is an apocalyptic number.

It is an amenable number.

18942090269 is a deficient number, since it is larger than the sum of its proper divisors (1).

18942090269 is an equidigital number, since it uses as much as digits as its factorization.

18942090269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 50.

The spelling of 18942090269 in words is "eighteen billion, nine hundred forty-two million, ninety thousand, two hundred sixty-nine".