859089369581 has 2 divisors, whose sum is σ = 859089369582. Its totient is φ = 859089369580.

The previous prime is 859089369569. The next prime is 859089369637. The reversal of 859089369581 is 185963980958.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 475742647081 + 383346722500 = 689741^2 + 619150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-859089369581 is a prime.

It is a super-2 number, since 2×859089369581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (859089369181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429544684790 + 429544684791.

It is an arithmetic number, because the mean of its divisors is an integer number (429544684791).

Almost surely, 2^859089369581 is an apocalyptic number.

It is an amenable number.

859089369581 is a deficient number, since it is larger than the sum of its proper divisors (1).

859089369581 is an equidigital number, since it uses as much as digits as its factorization.

859089369581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 167961600, while the sum is 71.

The spelling of 859089369581 in words is "eight hundred fifty-nine billion, eighty-nine million, three hundred sixty-nine thousand, five hundred eighty-one".