284385989861 has 2 divisors, whose sum is σ = 284385989862. Its totient is φ = 284385989860.

The previous prime is 284385989851. The next prime is 284385989887. The reversal of 284385989861 is 168989583482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228789065761 + 55596924100 = 478319^2 + 235790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-284385989861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (284385989851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142192994930 + 142192994931.

It is an arithmetic number, because the mean of its divisors is an integer number (142192994931).

Almost surely, 2^284385989861 is an apocalyptic number.

It is an amenable number.

284385989861 is a deficient number, since it is larger than the sum of its proper divisors (1).

284385989861 is an equidigital number, since it uses as much as digits as its factorization.

284385989861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238878720, while the sum is 71.

The spelling of 284385989861 in words is "two hundred eighty-four billion, three hundred eighty-five million, nine hundred eighty-nine thousand, eight hundred sixty-one".