311111312 has 10 divisors (see below), whose sum is σ = 602778198. Its totient is φ = 155555648.

The previous prime is 311111309. The next prime is 311111347. The reversal of 311111312 is 213111113.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 161391616 + 149719696 = 12704^2 + 12236^2 .

It is a super-2 number, since 2×311111312² = 193580496908722688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9722213 + ... + 9722244.

Almost surely, 2^311111312 is an apocalyptic number.

It is an amenable number.

311111312 is a deficient number, since it is larger than the sum of its proper divisors (291666886).

311111312 is a wasteful number, since it uses less digits than its factorization.

311111312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19444465 (or 19444459 counting only the distinct ones).

The product of its digits is 18, while the sum is 14.

The square root of 311111312 is about 17638.3477684277. The cubic root of 311111312 is about 677.5977170547.

Adding to 311111312 its reverse (213111113), we get a palindrome (524222425).

It can be divided in two parts, 31111 and 1312, that added together give a palindrome (32423).

The spelling of 311111312 in words is "three hundred eleven million, one hundred eleven thousand, three hundred twelve".