872315209 has 2 divisors, whose sum is σ = 872315210. Its totient is φ = 872315208.

The previous prime is 872315173. The next prime is 872315233. The reversal of 872315209 is 902513278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 526243600 + 346071609 = 22940^2 + 18603^2 .

It is a cyclic number.

It is not a de Polignac number, because 872315209 - 2⁹ = 872314697 is a prime.

It is not a weakly prime, because it can be changed into another prime (872313209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436157604 + 436157605.

It is an arithmetic number, because the mean of its divisors is an integer number (436157605).

Almost surely, 2^872315209 is an apocalyptic number.

It is an amenable number.

872315209 is a deficient number, since it is larger than the sum of its proper divisors (1).

872315209 is an equidigital number, since it uses as much as digits as its factorization.

872315209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 872315209 is about 29534.9828000627. The cubic root of 872315209 is about 955.4863376343.

It can be divided in two parts, 8723 and 15209, that added together give a palindrome (23932).

The spelling of 872315209 in words is "eight hundred seventy-two million, three hundred fifteen thousand, two hundred nine".