1813138219069 has 8 divisors (see below), whose sum is σ = 1919807242488. Its totient is φ = 1706470732800.

The previous prime is 1813138219019. The next prime is 1813138219091. The reversal of 1813138219069 is 9609128313181.

It can be written as a sum of positive squares in 4 ways, for example, as 50417313444 + 1762720905625 = 224538^2 + 1327675^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1813138219069 - 2¹⁷ = 1813138087997 is a prime.

It is a super-2 number, since 2×1813138219069² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813138219019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2796469 + ... + 3383269.

It is an arithmetic number, because the mean of its divisors is an integer number (239975905311).

Almost surely, 2^{1813138219069} is an apocalyptic number.

It is an amenable number.

1813138219069 is a deficient number, since it is larger than the sum of its proper divisors (106669023419).

1813138219069 is a wasteful number, since it uses less digits than its factorization.

1813138219069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768575.

The product of its (nonzero) digits is 559872, while the sum is 52.

The spelling of 1813138219069 in words is "one trillion, eight hundred thirteen billion, one hundred thirty-eight million, two hundred nineteen thousand, sixty-nine".