13138217905 has 4 divisors (see below), whose sum is σ = 15765861492. Its totient is φ = 10510574320.

The previous prime is 13138217887. The next prime is 13138217923. The reversal of 13138217905 is 50971283131.

13138217905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50971283131 = 12619 ⋅4039249.

It is an interprime number because it is at equal distance from previous prime (13138217887) and next prime (13138217923).

It can be written as a sum of positive squares in 2 ways, for example, as 4563272704 + 8574945201 = 67552^2 + 92601^2 .

It is not a de Polignac number, because 13138217905 - 2⁷ = 13138217777 is a prime.

It is a super-2 number, since 2×13138217905² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1313821786 + ... + 1313821795.

It is an arithmetic number, because the mean of its divisors is an integer number (3941465373).

Almost surely, 2^13138217905 is an apocalyptic number.

It is an amenable number.

13138217905 is a deficient number, since it is larger than the sum of its proper divisors (2627643587).

13138217905 is an equidigital number, since it uses as much as digits as its factorization.

13138217905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2627643586.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 13138217905 in words is "thirteen billion, one hundred thirty-eight million, two hundred seventeen thousand, nine hundred five".