11909791 has 4 divisors (see below), whose sum is σ = 12427632. Its totient is φ = 11391952.

The previous prime is 11909783. The next prime is 11909801. The reversal of 11909791 is 19790911.

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

It is a cyclic number.

It is not a de Polignac number, because 11909791 - 2³ = 11909783 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 11909791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11909771) 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, 258886 + ... + 258931.

It is an arithmetic number, because the mean of its divisors is an integer number (3106908).

Almost surely, 2^11909791 is an apocalyptic number.

11909791 is a deficient number, since it is larger than the sum of its proper divisors (517841).

11909791 is an equidigital number, since it uses as much as digits as its factorization.

11909791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517840.

The product of its (nonzero) digits is 5103, while the sum is 37.

The square root of 11909791 is about 3451.0565048982. The cubic root of 11909791 is about 228.3677186688.

The spelling of 11909791 in words is "eleven million, nine hundred nine thousand, seven hundred ninety-one".