802287821 has 2 divisors, whose sum is σ = 802287822. Its totient is φ = 802287820.

The previous prime is 802287767. The next prime is 802287823. The reversal of 802287821 is 128782208.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 685863721 + 116424100 = 26189^2 + 10790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-802287821 is a prime.

Together with 802287823, 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 (802287823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401143910 + 401143911.

It is an arithmetic number, because the mean of its divisors is an integer number (401143911).

Almost surely, 2^802287821 is an apocalyptic number.

It is an amenable number.

802287821 is a deficient number, since it is larger than the sum of its proper divisors (1).

802287821 is an equidigital number, since it uses as much as digits as its factorization.

802287821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 802287821 is about 28324.6857175856. The cubic root of 802287821 is about 929.2018515297.

The spelling of 802287821 in words is "eight hundred two million, two hundred eighty-seven thousand, eight hundred twenty-one".