312443213 has 2 divisors, whose sum is σ = 312443214. Its totient is φ = 312443212.

The previous prime is 312443191. The next prime is 312443233. The reversal of 312443213 is 312344213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 272019049 + 40424164 = 16493^2 + 6358^2 .

It is a cyclic number.

It is not a de Polignac number, because 312443213 - 2⁶ = 312443149 is a prime.

It is a super-2 number, since 2×312443213² = 195241522699526738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312443233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156221606 + 156221607.

It is an arithmetic number, because the mean of its divisors is an integer number (156221607).

Almost surely, 2^312443213 is an apocalyptic number.

It is an amenable number.

312443213 is a deficient number, since it is larger than the sum of its proper divisors (1).

312443213 is an equidigital number, since it uses as much as digits as its factorization.

312443213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 23.

The square root of 312443213 is about 17676.0632777777. The cubic root of 312443213 is about 678.5632966898.

Adding to 312443213 its reverse (312344213), we get a palindrome (624787426).

The spelling of 312443213 in words is "three hundred twelve million, four hundred forty-three thousand, two hundred thirteen".