138536091011 has 4 divisors (see below), whose sum is σ = 138542526024. Its totient is φ = 138529656000.

The previous prime is 138536090989. The next prime is 138536091019. The reversal of 138536091011 is 110190635831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110190635831 = 19 ⋅5799507149.

It is a cyclic number.

It is not a de Polignac number, because 138536091011 - 2⁶ = 138536090947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138536091019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3185105 + ... + 3228306.

It is an arithmetic number, because the mean of its divisors is an integer number (34635631506).

Almost surely, 2^138536091011 is an apocalyptic number.

138536091011 is a deficient number, since it is larger than the sum of its proper divisors (6435013).

138536091011 is an equidigital number, since it uses as much as digits as its factorization.

138536091011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6435012.

The product of its (nonzero) digits is 19440, while the sum is 38.

The spelling of 138536091011 in words is "one hundred thirty-eight billion, five hundred thirty-six million, ninety-one thousand, eleven".