86853821 has 2 divisors, whose sum is σ = 86853822. Its totient is φ = 86853820.

The previous prime is 86853797. The next prime is 86853857. The reversal of 86853821 is 12835868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69722500 + 17131321 = 8350^2 + 4139^2 .

It is a cyclic number.

It is not a de Polignac number, because 86853821 - 2¹⁰ = 86852797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86853881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43426910 + 43426911.

It is an arithmetic number, because the mean of its divisors is an integer number (43426911).

Almost surely, 2^86853821 is an apocalyptic number.

It is an amenable number.

86853821 is a deficient number, since it is larger than the sum of its proper divisors (1).

86853821 is an equidigital number, since it uses as much as digits as its factorization.

86853821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 41.

The square root of 86853821 is about 9319.5397418542. The cubic root of 86853821 is about 442.8564521222.

The spelling of 86853821 in words is "eighty-six million, eight hundred fifty-three thousand, eight hundred twenty-one".