312022020209 has 2 divisors, whose sum is σ = 312022020210. Its totient is φ = 312022020208.

The previous prime is 312022020199. The next prime is 312022020221. The reversal of 312022020209 is 902020220213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 305473973809 + 6548046400 = 552697^2 + 80920^2 .

It is a cyclic number.

It is not a de Polignac number, because 312022020209 - 2²⁴ = 312005242993 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (312022026209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156011010104 + 156011010105.

It is an arithmetic number, because the mean of its divisors is an integer number (156011010105).

Almost surely, 2^312022020209 is an apocalyptic number.

It is an amenable number.

312022020209 is a deficient number, since it is larger than the sum of its proper divisors (1).

312022020209 is an equidigital number, since it uses as much as digits as its factorization.

312022020209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The spelling of 312022020209 in words is "three hundred twelve billion, twenty-two million, twenty thousand, two hundred nine".