1138139191 has 16 divisors (see below), whose sum is σ = 1346803200. Its totient is φ = 941054688.

The previous prime is 1138139173. The next prime is 1138139207. The reversal of 1138139191 is 1919318311.

It is not a de Polignac number, because 1138139191 - 2⁷ = 1138139063 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1138139191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138139141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 326926 + ... + 330388.

It is an arithmetic number, because the mean of its divisors is an integer number (84175200).

Almost surely, 2^1138139191 is an apocalyptic number.

1138139191 is a deficient number, since it is larger than the sum of its proper divisors (208664009).

1138139191 is a wasteful number, since it uses less digits than its factorization.

1138139191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5118.

The product of its digits is 5832, while the sum is 37.

The square root of 1138139191 is about 33736.3185750906. The cubic root of 1138139191 is about 1044.0752304948.

The spelling of 1138139191 in words is "one billion, one hundred thirty-eight million, one hundred thirty-nine thousand, one hundred ninety-one".