312223213 has 4 divisors (see below), whose sum is σ = 312276640. Its totient is φ = 312169788.

The previous prime is 312223211. The next prime is 312223237. The reversal of 312223213 is 312322213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 312322213 = 7 ⋅44617459.

It is a 3-Lehmer number, since φ(312223213) divides (312223213-1)³.

It is a cyclic number.

It is not a de Polignac number, because 312223213 - 2¹ = 312223211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312223211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16695 + ... + 30052.

It is an arithmetic number, because the mean of its divisors is an integer number (78069160).

Almost surely, 2^312223213 is an apocalyptic number.

It is an amenable number.

312223213 is a deficient number, since it is larger than the sum of its proper divisors (53427).

312223213 is an equidigital number, since it uses as much as digits as its factorization.

312223213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53426.

The product of its digits is 432, while the sum is 19.

The square root of 312223213 is about 17669.8390767998. The cubic root of 312223213 is about 678.4039941658.

Adding to 312223213 its reverse (312322213), we get a palindrome (624545426).

It can be divided in two parts, 3122 and 23213, that added together give a triangular number (26335 = T₂₂₉).

The spelling of 312223213 in words is "three hundred twelve million, two hundred twenty-three thousand, two hundred thirteen".