865250189 has 2 divisors, whose sum is σ = 865250190. Its totient is φ = 865250188.

The previous prime is 865250167. The next prime is 865250203. The reversal of 865250189 is 981052568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 447660964 + 417589225 = 21158^2 + 20435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-865250189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865250149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432625094 + 432625095.

It is an arithmetic number, because the mean of its divisors is an integer number (432625095).

Almost surely, 2^865250189 is an apocalyptic number.

It is an amenable number.

865250189 is a deficient number, since it is larger than the sum of its proper divisors (1).

865250189 is an equidigital number, since it uses as much as digits as its factorization.

865250189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 44.

The square root of 865250189 is about 29415.1353727975. The cubic root of 865250189 is about 952.8997966674.

The spelling of 865250189 in words is "eight hundred sixty-five million, two hundred fifty thousand, one hundred eighty-nine".