869585813 has 2 divisors, whose sum is σ = 869585814. Its totient is φ = 869585812.

The previous prime is 869585767. The next prime is 869585881. The reversal of 869585813 is 318585968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 509269489 + 360316324 = 22567^2 + 18982^2 .

It is a cyclic number.

It is not a de Polignac number, because 869585813 - 2²² = 865391509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869585413) 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, 434792906 + 434792907.

It is an arithmetic number, because the mean of its divisors is an integer number (434792907).

Almost surely, 2^869585813 is an apocalyptic number.

It is an amenable number.

869585813 is a deficient number, since it is larger than the sum of its proper divisors (1).

869585813 is an equidigital number, since it uses as much as digits as its factorization.

869585813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2073600, while the sum is 53.

The square root of 869585813 is about 29488.7404444476. The cubic root of 869585813 is about 954.4887527929.

The spelling of 869585813 in words is "eight hundred sixty-nine million, five hundred eighty-five thousand, eight hundred thirteen".