138091211 has 8 divisors (see below), whose sum is σ = 140712000. Its totient is φ = 135479880.

The previous prime is 138091199. The next prime is 138091229. The reversal of 138091211 is 112190831.

138091211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 138091211 - 2¹⁰ = 138090187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138093211) 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, 31640 + ... + 35738.

It is an arithmetic number, because the mean of its divisors is an integer number (17589000).

Almost surely, 2^138091211 is an apocalyptic number.

138091211 is a deficient number, since it is larger than the sum of its proper divisors (2620789).

138091211 is an equidigital number, since it uses as much as digits as its factorization.

138091211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4729.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 138091211 is about 11751.2216811700. The cubic root of 138091211 is about 516.8787519631.

The spelling of 138091211 in words is "one hundred thirty-eight million, ninety-one thousand, two hundred eleven".