11391139 has 16 divisors (see below), whose sum is σ = 12499488. Its totient is φ = 10340352.

The previous prime is 11391119. The next prime is 11391151. The reversal of 11391139 is 93119311.

11391139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-11391139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11391119) 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, 83079 + ... + 83215.

It is an arithmetic number, because the mean of its divisors is an integer number (781218).

Almost surely, 2^11391139 is an apocalyptic number.

11391139 is a deficient number, since it is larger than the sum of its proper divisors (1108349).

11391139 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (11391138) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (294).

11391139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294.

The product of its digits is 729, while the sum is 28.

The square root of 11391139 is about 3375.0761472891. The cubic root of 11391139 is about 225.0033843112.

It can be divided in two parts, 1139 and 1139, that added together give a triangular number (2278 = T₆₇).

The spelling of 11391139 in words is "eleven million, three hundred ninety-one thousand, one hundred thirty-nine".