7111112311 has 4 divisors (see below), whose sum is σ = 7485381400. Its totient is φ = 6736843224.

The previous prime is 7111112231. The next prime is 7111112321. The reversal of 7111112311 is 1132111117.

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

It is a de Polignac number, because none of the positive numbers 2^k-7111112311 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 374269069 = 7111112311 / (7 + 1 + 1 + 1 + 1 + 1 + 2 + 3 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7111112321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187134516 + ... + 187134553.

It is an arithmetic number, because the mean of its divisors is an integer number (1871345350).

Almost surely, 2^7111112311 is an apocalyptic number.

7111112311 is a deficient number, since it is larger than the sum of its proper divisors (374269089).

7111112311 is a wasteful number, since it uses less digits than its factorization.

7111112311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374269088.

The product of its digits is 42, while the sum is 19.

The square root of 7111112311 is about 84327.4113856224. The cubic root of 7111112311 is about 1922.9995352352. Note that the first 3 decimals are identical.

Adding to 7111112311 its reverse (1132111117), we get a palindrome (8243223428).

The spelling of 7111112311 in words is "seven billion, one hundred eleven million, one hundred twelve thousand, three hundred eleven".