11915391 has 4 divisors (see below), whose sum is σ = 15887192. Its totient is φ = 7943592.

The previous prime is 11915363. The next prime is 11915399. The reversal of 11915391 is 19351911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19351911 = 3 ⋅6450637.

It is not a de Polignac number, because 11915391 - 2⁷ = 11915263 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 (11915399) 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, 1985896 + ... + 1985901.

It is an arithmetic number, because the mean of its divisors is an integer number (3971798).

Almost surely, 2^11915391 is an apocalyptic number.

11915391 is a deficient number, since it is larger than the sum of its proper divisors (3971801).

11915391 is an equidigital number, since it uses as much as digits as its factorization.

11915391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3971800.

The product of its digits is 1215, while the sum is 30.

The square root of 11915391 is about 3451.8677552884. The cubic root of 11915391 is about 228.4035059981.

The spelling of 11915391 in words is "eleven million, nine hundred fifteen thousand, three hundred ninety-one".