65087821 has 2 divisors, whose sum is σ = 65087822. Its totient is φ = 65087820.

The previous prime is 65087807. The next prime is 65087833. The reversal of 65087821 is 12878056.

65087821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44702596 + 20385225 = 6686^2 + 4515^2 .

It is a cyclic number.

It is not a de Polignac number, because 65087821 - 2¹³ = 65079629 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65087221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32543910 + 32543911.

It is an arithmetic number, because the mean of its divisors is an integer number (32543911).

Almost surely, 2^65087821 is an apocalyptic number.

It is an amenable number.

65087821 is a deficient number, since it is larger than the sum of its proper divisors (1).

65087821 is an equidigital number, since it uses as much as digits as its factorization.

65087821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 65087821 is about 8067.7023370970. The cubic root of 65087821 is about 402.2535734234.

The spelling of 65087821 in words is "sixty-five million, eighty-seven thousand, eight hundred twenty-one".