288487085921 has 4 divisors (see below), whose sum is σ = 298434916500. Its totient is φ = 278539255344.

The previous prime is 288487085891. The next prime is 288487085927. The reversal of 288487085921 is 129580784882.

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 159220950625 + 129266135296 = 399025^2 + 359536^2 .

It is a cyclic number.

It is not a de Polignac number, because 288487085921 - 2⁶ = 288487085857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (288487085927) 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 in 3 ways as a sum of consecutive naturals, for example, 4973915246 + ... + 4973915303.

It is an arithmetic number, because the mean of its divisors is an integer number (74608729125).

Almost surely, 2^288487085921 is an apocalyptic number.

It is an amenable number.

288487085921 is a deficient number, since it is larger than the sum of its proper divisors (9947830579).

288487085921 is an equidigital number, since it uses as much as digits as its factorization.

288487085921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9947830578.

The product of its (nonzero) digits is 20643840, while the sum is 62.

The spelling of 288487085921 in words is "two hundred eighty-eight billion, four hundred eighty-seven million, eighty-five thousand, nine hundred twenty-one".