86826821 has 2 divisors, whose sum is σ = 86826822. Its totient is φ = 86826820.

The previous prime is 86826811. The next prime is 86826829. The reversal of 86826821 is 12862868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75864100 + 10962721 = 8710^2 + 3311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86826821 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 (86826829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43413410 + 43413411.

It is an arithmetic number, because the mean of its divisors is an integer number (43413411).

Almost surely, 2^86826821 is an apocalyptic number.

It is an amenable number.

86826821 is a deficient number, since it is larger than the sum of its proper divisors (1).

86826821 is an equidigital number, since it uses as much as digits as its factorization.

86826821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 41.

The square root of 86826821 is about 9318.0910598684. The cubic root of 86826821 is about 442.8105575248.

The spelling of 86826821 in words is "eighty-six million, eight hundred twenty-six thousand, eight hundred twenty-one".