311213112 has 48 divisors (see below), whose sum is σ = 905061960. Its totient is φ = 88917696.

The previous prime is 311213107. The next prime is 311213113. The reversal of 311213112 is 211312113.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 311213091 and 311213100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311213113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131143 + ... + 133494.

Almost surely, 2^311213112 is an apocalyptic number.

It is an amenable number.

311213112 is an abundant number, since it is smaller than the sum of its proper divisors (593848848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311213112 is a wasteful number, since it uses less digits than its factorization.

311213112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264660 (or 264649 counting only the distinct ones).

The product of its digits is 36, while the sum is 15.

The square root of 311213112 is about 17641.2332902210. The cubic root of 311213112 is about 677.6716154983.

Adding to 311213112 its reverse (211312113), we get a palindrome (522525225).

Subtracting from 311213112 its reverse (211312113), we obtain a palindrome (99900999).

The spelling of 311213112 in words is "three hundred eleven million, two hundred thirteen thousand, one hundred twelve".