118721111 has 4 divisors (see below), whose sum is σ = 118751352. Its totient is φ = 118690872.

The previous prime is 118721087. The next prime is 118721129. The reversal of 118721111 is 111127811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111127811 = 191 ⋅581821.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118721111 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 (118721131) 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, 8165 + ... + 17438.

It is an arithmetic number, because the mean of its divisors is an integer number (29687838).

Almost surely, 2^118721111 is an apocalyptic number.

118721111 is a deficient number, since it is larger than the sum of its proper divisors (30241).

118721111 is an equidigital number, since it uses as much as digits as its factorization.

118721111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30240.

The product of its digits is 112, while the sum is 23.

The square root of 118721111 is about 10895.9217599981. The cubic root of 118721111 is about 491.4839244007.

Adding to 118721111 its reverse (111127811), we get a palindrome (229848922).

The spelling of 118721111 in words is "one hundred eighteen million, seven hundred twenty-one thousand, one hundred eleven".