312122043209 has 2 divisors, whose sum is σ = 312122043210. Its totient is φ = 312122043208.

The previous prime is 312122043173. The next prime is 312122043223. The reversal of 312122043209 is 902340221213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245746249984 + 66375793225 = 495728^2 + 257635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312122043209 is a prime.

It is not a weakly prime, because it can be changed into another prime (312122043509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156061021604 + 156061021605.

It is an arithmetic number, because the mean of its divisors is an integer number (156061021605).

Almost surely, 2^312122043209 is an apocalyptic number.

It is an amenable number.

312122043209 is a deficient number, since it is larger than the sum of its proper divisors (1).

312122043209 is an equidigital number, since it uses as much as digits as its factorization.

312122043209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 312122043209 in words is "three hundred twelve billion, one hundred twenty-two million, forty-three thousand, two hundred nine".