311231101212 has 36 divisors (see below), whose sum is σ = 833000890176. Its totient is φ = 97641129600.

The previous prime is 311231101201. The next prime is 311231101243. The reversal of 311231101212 is 212101132113.

311231101212 is a `hidden beast` number, since 311 + 231 + 1 + 0 + 121 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 254273164 + ... + 254274387.

It is an arithmetic number, because the mean of its divisors is an integer number (23138913616).

Almost surely, 2^311231101212 is an apocalyptic number.

It is an amenable number.

311231101212 is an abundant number, since it is smaller than the sum of its proper divisors (521769788964).

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

311231101212 is a wasteful number, since it uses less digits than its factorization.

311231101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508547578 (or 508547573 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 311231101212 its reverse (212101132113), we get a palindrome (523332233325).

The spelling of 311231101212 in words is "three hundred eleven billion, two hundred thirty-one million, one hundred one thousand, two hundred twelve".