11720111 has 4 divisors (see below), whose sum is σ = 12621672. Its totient is φ = 10818552.

The previous prime is 11720099. The next prime is 11720117. The reversal of 11720111 is 11102711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11102711 = 193 ⋅57527.

It is a cyclic number.

It is not a de Polignac number, because 11720111 - 2⁶ = 11720047 is a prime.

It is a super-2 number, since 2×11720111² = 274722003704642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11720117) 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, 450761 + ... + 450786.

It is an arithmetic number, because the mean of its divisors is an integer number (3155418).

Almost surely, 2^11720111 is an apocalyptic number.

11720111 is a deficient number, since it is larger than the sum of its proper divisors (901561).

11720111 is an equidigital number, since it uses as much as digits as its factorization.

11720111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901560.

The product of its (nonzero) digits is 14, while the sum is 14.

The square root of 11720111 is about 3423.4647654095. The cubic root of 11720111 is about 227.1488670121.

Adding to 11720111 its reverse (11102711), we get a palindrome (22822822).

The spelling of 11720111 in words is "eleven million, seven hundred twenty thousand, one hundred eleven".