86646421 has 2 divisors, whose sum is σ = 86646422. Its totient is φ = 86646420.

The previous prime is 86646383. The next prime is 86646449. The reversal of 86646421 is 12464668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83923921 + 2722500 = 9161^2 + 1650^2 .

It is a cyclic number.

It is not a de Polignac number, because 86646421 - 2²³ = 78257813 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 (86646491) 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, 43323210 + 43323211.

It is an arithmetic number, because the mean of its divisors is an integer number (43323211).

Almost surely, 2^86646421 is an apocalyptic number.

It is an amenable number.

86646421 is a deficient number, since it is larger than the sum of its proper divisors (1).

86646421 is an equidigital number, since it uses as much as digits as its factorization.

86646421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 37.

The square root of 86646421 is about 9308.4059322743. The cubic root of 86646421 is about 442.5036692004.

The spelling of 86646421 in words is "eighty-six million, six hundred forty-six thousand, four hundred twenty-one".