284121807989 has 4 divisors (see below), whose sum is σ = 284125257324. Its totient is φ = 284118358656.

The previous prime is 284121807947. The next prime is 284121808013. The reversal of 284121807989 is 989708121482.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 236033703889 + 48088104100 = 485833^2 + 219290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-284121807989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (284121807929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1598012 + ... + 1766885.

It is an arithmetic number, because the mean of its divisors is an integer number (71031314331).

Almost surely, 2^284121807989 is an apocalyptic number.

It is an amenable number.

284121807989 is a deficient number, since it is larger than the sum of its proper divisors (3449335).

284121807989 is an equidigital number, since it uses as much as digits as its factorization.

284121807989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3449334.

The product of its (nonzero) digits is 4644864, while the sum is 59.

The spelling of 284121807989 in words is "two hundred eighty-four billion, one hundred twenty-one million, eight hundred seven thousand, nine hundred eighty-nine".