11931109 has 4 divisors (see below), whose sum is σ = 11943340. Its totient is φ = 11918880.

The previous prime is 11931079. The next prime is 11931113. The reversal of 11931109 is 90113911.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2259009 + 9672100 = 1503^2 + 3110^2 .

It is a cyclic number.

It is not a de Polignac number, because 11931109 - 2¹⁷ = 11800037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11931509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4512 + ... + 6649.

It is an arithmetic number, because the mean of its divisors is an integer number (2985835).

Almost surely, 2^11931109 is an apocalyptic number.

It is an amenable number.

11931109 is a deficient number, since it is larger than the sum of its proper divisors (12231).

11931109 is a wasteful number, since it uses less digits than its factorization.

11931109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12230.

The product of its (nonzero) digits is 243, while the sum is 25.

The square root of 11931109 is about 3454.1437433900. The cubic root of 11931109 is about 228.5038934963.

The spelling of 11931109 in words is "eleven million, nine hundred thirty-one thousand, one hundred nine".