288634436821 has 2 divisors, whose sum is σ = 288634436822. Its totient is φ = 288634436820.

The previous prime is 288634436803. The next prime is 288634436891. The reversal of 288634436821 is 128634436882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186352802596 + 102281634225 = 431686^2 + 319815^2 .

It is a cyclic number.

It is not a de Polignac number, because 288634436821 - 2⁵ = 288634436789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (288634436891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144317218410 + 144317218411.

It is an arithmetic number, because the mean of its divisors is an integer number (144317218411).

Almost surely, 2^288634436821 is an apocalyptic number.

It is an amenable number.

288634436821 is a deficient number, since it is larger than the sum of its proper divisors (1).

288634436821 is an equidigital number, since it uses as much as digits as its factorization.

288634436821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10616832, while the sum is 55.

The spelling of 288634436821 in words is "two hundred eighty-eight billion, six hundred thirty-four million, four hundred thirty-six thousand, eight hundred twenty-one".