285898898581 has 2 divisors, whose sum is σ = 285898898582. Its totient is φ = 285898898580.

The previous prime is 285898898567. The next prime is 285898898611. The reversal of 285898898581 is 185898898582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172104671025 + 113794227556 = 414855^2 + 337334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285898898581 is a prime.

It is a super-2 number, since 2×285898898581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285898898501) 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, 142949449290 + 142949449291.

It is an arithmetic number, because the mean of its divisors is an integer number (142949449291).

Almost surely, 2^285898898581 is an apocalyptic number.

It is an amenable number.

285898898581 is a deficient number, since it is larger than the sum of its proper divisors (1).

285898898581 is an equidigital number, since it uses as much as digits as its factorization.

285898898581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1061683200, while the sum is 79.

Subtracting from 285898898581 its reverse (185898898582), we obtain a palindrome (99999999999).

The spelling of 285898898581 in words is "two hundred eighty-five billion, eight hundred ninety-eight million, eight hundred ninety-eight thousand, five hundred eighty-one".