312115213 has 2 divisors, whose sum is σ = 312115214. Its totient is φ = 312115212.

The previous prime is 312115183. The next prime is 312115241. The reversal of 312115213 is 312511213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311804964 + 310249 = 17658^2 + 557^2 .

It is a cyclic number.

It is not a de Polignac number, because 312115213 - 2²⁵ = 278560781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312115253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156057606 + 156057607.

It is an arithmetic number, because the mean of its divisors is an integer number (156057607).

Almost surely, 2^312115213 is an apocalyptic number.

It is an amenable number.

312115213 is a deficient number, since it is larger than the sum of its proper divisors (1).

312115213 is an equidigital number, since it uses as much as digits as its factorization.

312115213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 19.

The square root of 312115213 is about 17666.7827574802. The cubic root of 312115213 is about 678.3257637227.

Adding to 312115213 its reverse (312511213), we get a palindrome (624626426).

The spelling of 312115213 in words is "three hundred twelve million, one hundred fifteen thousand, two hundred thirteen".