1211112311 has 8 divisors (see below), whose sum is σ = 1276284384. Its totient is φ = 1146983200.

The previous prime is 1211112271. The next prime is 1211112323. The reversal of 1211112311 is 1132111121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211112311 - 2¹⁴ = 1211095927 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 (1211112341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258356 + ... + 263001.

It is an arithmetic number, because the mean of its divisors is an integer number (159535548).

Almost surely, 2^1211112311 is an apocalyptic number.

1211112311 is a deficient number, since it is larger than the sum of its proper divisors (65172073).

1211112311 is a wasteful number, since it uses less digits than its factorization.

1211112311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521481.

The product of its digits is 12, while the sum is 14.

The square root of 1211112311 is about 34801.0389356410. The cubic root of 1211112311 is about 1065.9286604798.

Adding to 1211112311 its reverse (1132111121), we get a palindrome (2343223432).

The spelling of 1211112311 in words is "one billion, two hundred eleven million, one hundred twelve thousand, three hundred eleven".