311212112031 has 48 divisors (see below), whose sum is σ = 481826180160. Its totient is φ = 193180861440.

The previous prime is 311212111943. The next prime is 311212112087. The reversal of 311212112031 is 130211212113.

311212112031 is a `hidden beast` number, since 311 + 212 + 112 + 0 + 31 = 666.

It is not a de Polignac number, because 311212112031 - 2⁹ = 311212111519 is a prime.

It is a super-2 number, since 2×311212112031² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 311212111995 and 311212112013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311212111031) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 948646 + ... + 1233836.

It is an arithmetic number, because the mean of its divisors is an integer number (10038045420).

Almost surely, 2^311212112031 is an apocalyptic number.

311212112031 is a deficient number, since it is larger than the sum of its proper divisors (170614068129).

311212112031 is a wasteful number, since it uses less digits than its factorization.

311212112031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285376 (or 285373 counting only the distinct ones).

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

Adding to 311212112031 its reverse (130211212113), we get a palindrome (441423324144).

The spelling of 311212112031 in words is "three hundred eleven billion, two hundred twelve million, one hundred twelve thousand, thirty-one".