111131231312 has 20 divisors (see below), whose sum is σ = 217222222260. Its totient is φ = 55073883648.

The previous prime is 111131231303. The next prime is 111131231371. The reversal of 111131231312 is 213132131111.

It can be written as a sum of positive squares in 2 ways, for example, as 32340986896 + 78790244416 = 179836^2 + 280696^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30731387 + ... + 30735002.

It is an arithmetic number, because the mean of its divisors is an integer number (10861111113).

Almost surely, 2^111131231312 is an apocalyptic number.

It is an amenable number.

111131231312 is a deficient number, since it is larger than the sum of its proper divisors (106090990948).

111131231312 is a wasteful number, since it uses less digits than its factorization.

111131231312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61466510 (or 61466504 counting only the distinct ones).

The product of its digits is 108, while the sum is 20.

Adding to 111131231312 its reverse (213132131111), we get a palindrome (324263362423).

The spelling of 111131231312 in words is "one hundred eleven billion, one hundred thirty-one million, two hundred thirty-one thousand, three hundred twelve".