138195013 has 4 divisors (see below), whose sum is σ = 150758208. Its totient is φ = 125631820.

The previous prime is 138195007. The next prime is 138195019. The reversal of 138195013 is 310591831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 310591831 = 11 ⋅28235621.

It is an interprime number because it is at equal distance from previous prime (138195007) and next prime (138195019).

It is a cyclic number.

It is not a de Polignac number, because 138195013 - 2⁹ = 138194501 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138195019) 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 in 3 ways as a sum of consecutive naturals, for example, 6281581 + ... + 6281602.

It is an arithmetic number, because the mean of its divisors is an integer number (37689552).

Almost surely, 2^138195013 is an apocalyptic number.

It is an amenable number.

138195013 is a deficient number, since it is larger than the sum of its proper divisors (12563195).

138195013 is a wasteful number, since it uses less digits than its factorization.

138195013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12563194.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 138195013 is about 11755.6374986642. The cubic root of 138195013 is about 517.0082306604.

The spelling of 138195013 in words is "one hundred thirty-eight million, one hundred ninety-five thousand, thirteen".