865513189 has 2 divisors, whose sum is σ = 865513190. Its totient is φ = 865513188.

The previous prime is 865513171. The next prime is 865513219. The reversal of 865513189 is 981315568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 741636289 + 123876900 = 27233^2 + 11130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-865513189 is a prime.

It is a super-2 number, since 2×865513189² = 1498226160665899442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865513489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432756594 + 432756595.

It is an arithmetic number, because the mean of its divisors is an integer number (432756595).

Almost surely, 2^865513189 is an apocalyptic number.

It is an amenable number.

865513189 is a deficient number, since it is larger than the sum of its proper divisors (1).

865513189 is an equidigital number, since it uses as much as digits as its factorization.

865513189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 46.

The square root of 865513189 is about 29419.6055208087. The cubic root of 865513189 is about 952.9963341630.

The spelling of 865513189 in words is "eight hundred sixty-five million, five hundred thirteen thousand, one hundred eighty-nine".