312115212 has 36 divisors (see below), whose sum is σ = 800739576. Its totient is φ = 102484800.

The previous prime is 312115183. The next prime is 312115213. The reversal of 312115212 is 212511213.

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 not an unprimeable number, because it can be changed into a prime (312115213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62289 + ... + 67112.

It is an arithmetic number, because the mean of its divisors is an integer number (22242766).

Almost surely, 2^312115212 is an apocalyptic number.

It is an amenable number.

312115212 is an abundant number, since it is smaller than the sum of its proper divisors (488624364).

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

312115212 is a wasteful number, since it uses less digits than its factorization.

312115212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129478 (or 129473 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 312115212 is about 17666.7827291785. The cubic root of 312115212 is about 678.3257629982.

Adding to 312115212 its reverse (212511213), we get a palindrome (524626425).

The spelling of 312115212 in words is "three hundred twelve million, one hundred fifteen thousand, two hundred twelve".