312131322 has 24 divisors (see below), whose sum is σ = 716066676. Its totient is φ = 97923456.

The previous prime is 312131317. The next prime is 312131333. The reversal of 312131322 is 223131213.

312131322 is a `hidden beast` number, since 312 + 1 + 31 + 322 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 310852161 + 1279161 = 17631^2 + 1131^2 .

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

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 = 312131295 and 312131304.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 509713 + ... + 510324.

Almost surely, 2^312131322 is an apocalyptic number.

312131322 is an abundant number, since it is smaller than the sum of its proper divisors (403935354).

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

312131322 is a wasteful number, since it uses less digits than its factorization.

312131322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020062 (or 1020059 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 312131322 is about 17667.2386636961. The cubic root of 312131322 is about 678.3374335178.

Adding to 312131322 its reverse (223131213), we get a palindrome (535262535).

It can be divided in two parts, 3121 and 31322, that added together give a palindrome (34443).

The spelling of 312131322 in words is "three hundred twelve million, one hundred thirty-one thousand, three hundred twenty-two".