872017189 has 2 divisors, whose sum is σ = 872017190. Its totient is φ = 872017188.

The previous prime is 872017187. The next prime is 872017277. The reversal of 872017189 is 981710278.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 805594689 + 66422500 = 28383^2 + 8150^2 .

It is a cyclic number.

It is not a de Polignac number, because 872017189 - 2¹ = 872017187 is a prime.

It is a super-2 number, since 2×872017189² = 1520827955822923442, which contains 22 as substring.

Together with 872017187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (872017187) 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, 436008594 + 436008595.

It is an arithmetic number, because the mean of its divisors is an integer number (436008595).

Almost surely, 2^872017189 is an apocalyptic number.

It is an amenable number.

872017189 is a deficient number, since it is larger than the sum of its proper divisors (1).

872017189 is an equidigital number, since it uses as much as digits as its factorization.

872017189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 872017189 is about 29529.9371655275. The cubic root of 872017189 is about 955.3775136414.

The spelling of 872017189 in words is "eight hundred seventy-two million, seventeen thousand, one hundred eighty-nine".