18850989229 has 2 divisors, whose sum is σ = 18850989230. Its totient is φ = 18850989228.

The previous prime is 18850989203. The next prime is 18850989233. The reversal of 18850989229 is 92298905881.

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., 18768452004 + 82537225 = 136998^2 + 9085^2 .

It is a cyclic number.

It is not a de Polignac number, because 18850989229 - 2²¹ = 18848892077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18850989329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9425494614 + 9425494615.

It is an arithmetic number, because the mean of its divisors is an integer number (9425494615).

Almost surely, 2^18850989229 is an apocalyptic number.

It is an amenable number.

18850989229 is a deficient number, since it is larger than the sum of its proper divisors (1).

18850989229 is an equidigital number, since it uses as much as digits as its factorization.

18850989229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7464960, while the sum is 61.

The spelling of 18850989229 in words is "eighteen billion, eight hundred fifty million, nine hundred eighty-nine thousand, two hundred twenty-nine".