872313209 has 2 divisors, whose sum is σ = 872313210. Its totient is φ = 872313208.

The previous prime is 872313193. The next prime is 872313227. The reversal of 872313209 is 902313278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 464273209 + 408040000 = 21547^2 + 20200^2 .

It is a cyclic number.

It is not a de Polignac number, because 872313209 - 2⁴ = 872313193 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 (872313109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436156604 + 436156605.

It is an arithmetic number, because the mean of its divisors is an integer number (436156605).

Almost surely, 2^872313209 is an apocalyptic number.

It is an amenable number.

872313209 is a deficient number, since it is larger than the sum of its proper divisors (1).

872313209 is an equidigital number, since it uses as much as digits as its factorization.

872313209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 872313209 is about 29534.9489418892. The cubic root of 872313209 is about 955.4856074036.

The spelling of 872313209 in words is "eight hundred seventy-two million, three hundred thirteen thousand, two hundred nine".