312011213 has 2 divisors, whose sum is σ = 312011214. Its totient is φ = 312011212.

The previous prime is 312011207. The next prime is 312011257. The reversal of 312011213 is 312110213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302690404 + 9320809 = 17398^2 + 3053^2 .

It is an emirp because it is prime and its reverse (312110213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312011213 - 2¹² = 312007117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312011263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156005606 + 156005607.

It is an arithmetic number, because the mean of its divisors is an integer number (156005607).

Almost surely, 2^312011213 is an apocalyptic number.

It is an amenable number.

312011213 is a deficient number, since it is larger than the sum of its proper divisors (1).

312011213 is an equidigital number, since it uses as much as digits as its factorization.

312011213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 312011213 is about 17663.8391353635. The cubic root of 312011213 is about 678.2504136452.

Adding to 312011213 its reverse (312110213), we get a palindrome (624121426).

The spelling of 312011213 in words is "three hundred twelve million, eleven thousand, two hundred thirteen".