872015321 has 2 divisors, whose sum is σ = 872015322. Its totient is φ = 872015320.

The previous prime is 872015311. The next prime is 872015341. The reversal of 872015321 is 123510278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 685392400 + 186622921 = 26180^2 + 13661^2 .

It is a cyclic number.

It is not a de Polignac number, because 872015321 - 2⁶ = 872015257 is a prime.

It is not a weakly prime, because it can be changed into another prime (872015311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436007660 + 436007661.

It is an arithmetic number, because the mean of its divisors is an integer number (436007661).

Almost surely, 2^872015321 is an apocalyptic number.

It is an amenable number.

872015321 is a deficient number, since it is larger than the sum of its proper divisors (1).

872015321 is an equidigital number, since it uses as much as digits as its factorization.

872015321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 872015321 is about 29529.9055365912. The cubic root of 872015321 is about 955.3768314505.

Adding to 872015321 its reverse (123510278), we get a palindrome (995525599).

The spelling of 872015321 in words is "eight hundred seventy-two million, fifteen thousand, three hundred twenty-one".