111720711 has 4 divisors (see below), whose sum is σ = 148960952. Its totient is φ = 74480472.

The previous prime is 111720709. The next prime is 111720737. The reversal of 111720711 is 117027111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 117027111 = 3 ⋅39009037.

It is not a de Polignac number, because 111720711 - 2¹ = 111720709 is a prime.

It is a super-3 number, since 3×111720711³ (a number of 25 digits) contains 333 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 (111720761) 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, 18620116 + ... + 18620121.

It is an arithmetic number, because the mean of its divisors is an integer number (37240238).

Almost surely, 2^111720711 is an apocalyptic number.

111720711 is a deficient number, since it is larger than the sum of its proper divisors (37240241).

111720711 is an equidigital number, since it uses as much as digits as its factorization.

111720711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37240240.

The product of its (nonzero) digits is 98, while the sum is 21.

The square root of 111720711 is about 10569.8018429865. The cubic root of 111720711 is about 481.6274489580.

Adding to 111720711 its reverse (117027111), we get a palindrome (228747822).

The spelling of 111720711 in words is "one hundred eleven million, seven hundred twenty thousand, seven hundred eleven".