872399617 has 2 divisors, whose sum is σ = 872399618. Its totient is φ = 872399616.

The previous prime is 872399543. The next prime is 872399621. The reversal of 872399617 is 716993278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 671639056 + 200760561 = 25916^2 + 14169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-872399617 is a prime.

It is a super-2 number, since 2×872399617² = 1522162183483493378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (872399657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436199808 + 436199809.

It is an arithmetic number, because the mean of its divisors is an integer number (436199809).

Almost surely, 2^872399617 is an apocalyptic number.

It is an amenable number.

872399617 is a deficient number, since it is larger than the sum of its proper divisors (1).

872399617 is an equidigital number, since it uses as much as digits as its factorization.

872399617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 52.

The square root of 872399617 is about 29536.4117150340. The cubic root of 872399617 is about 955.5171552749.

The spelling of 872399617 in words is "eight hundred seventy-two million, three hundred ninety-nine thousand, six hundred seventeen".