284321981261 has 2 divisors, whose sum is σ = 284321981262. Its totient is φ = 284321981260.

The previous prime is 284321981239. The next prime is 284321981263. The reversal of 284321981261 is 162189123482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 270406240036 + 13915741225 = 520006^2 + 117965^2 .

It is a cyclic number.

It is not a de Polignac number, because 284321981261 - 2¹⁰ = 284321980237 is a prime.

Together with 284321981263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (284321981263) 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, 142160990630 + 142160990631.

It is an arithmetic number, because the mean of its divisors is an integer number (142160990631).

Almost surely, 2^284321981261 is an apocalyptic number.

It is an amenable number.

284321981261 is a deficient number, since it is larger than the sum of its proper divisors (1).

284321981261 is an equidigital number, since it uses as much as digits as its factorization.

284321981261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 47.

The spelling of 284321981261 in words is "two hundred eighty-four billion, three hundred twenty-one million, nine hundred eighty-one thousand, two hundred sixty-one".