312345522 has 96 divisors (see below), whose sum is σ = 779051520. Its totient is φ = 89786880.

The previous prime is 312345521. The next prime is 312345533. The reversal of 312345522 is 225543213.

It is a happy number.

312345522 is a `hidden beast` number, since 312 + 345 + 5 + 2 + 2 = 666.

312345522 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×312345522² = 195119450226904968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (312345521) 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 47 ways as a sum of consecutive naturals, for example, 179368 + ... + 181100.

It is an arithmetic number, because the mean of its divisors is an integer number (8115120).

Almost surely, 2^312345522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 312345522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (389525760).

312345522 is an abundant number, since it is smaller than the sum of its proper divisors (466705998).

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

312345522 is a wasteful number, since it uses less digits than its factorization.

312345522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808 (or 1805 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 312345522 is about 17673.2996919081. The cubic root of 312345522 is about 678.4925676374.

Adding to 312345522 its reverse (225543213), we get a palindrome (537888735).

The spelling of 312345522 in words is "three hundred twelve million, three hundred forty-five thousand, five hundred twenty-two".