111722013 has 18 divisors (see below), whose sum is σ = 174747066. Its totient is φ = 68751072.

The previous prime is 111721997. The next prime is 111722021. The reversal of 111722013 is 310227111.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 777924 + 110944089 = 882^2 + 10533^2 .

It is not a de Polignac number, because 111722013 - 2⁴ = 111721997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111722053) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 35206 + ... + 38247.

Almost surely, 2^111722013 is an apocalyptic number.

111722013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

111722013 is a deficient number, since it is larger than the sum of its proper divisors (63025053).

111722013 is a wasteful number, since it uses less digits than its factorization.

111722013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73485 (or 73469 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 111722013 is about 10569.8634333656. The cubic root of 111722013 is about 481.6293199227.

Adding to 111722013 its reverse (310227111), we get a palindrome (421949124).

The spelling of 111722013 in words is "one hundred eleven million, seven hundred twenty-two thousand, thirteen".