312213331 has 4 divisors (see below), whose sum is σ = 313509064. Its totient is φ = 310917600.

The previous prime is 312213329. The next prime is 312213353. The reversal of 312213331 is 133312213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 312213331 - 2¹ = 312213329 is a prime.

It is a super-2 number, since 2×312213331² = 194954328108231122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312213299 and 312213308.

It is not an unprimeable number, because it can be changed into a prime (312213361) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 647505 + ... + 647986.

It is an arithmetic number, because the mean of its divisors is an integer number (78377266).

Almost surely, 2^312213331 is an apocalyptic number.

312213331 is a deficient number, since it is larger than the sum of its proper divisors (1295733).

312213331 is a wasteful number, since it uses less digits than its factorization.

312213331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295732.

The product of its digits is 324, while the sum is 19.

The square root of 312213331 is about 17669.5594455549. The cubic root of 312213331 is about 678.3968368301.

Adding to 312213331 its reverse (133312213), we get a palindrome (445525544).

The spelling of 312213331 in words is "three hundred twelve million, two hundred thirteen thousand, three hundred thirty-one".