86644421 has 2 divisors, whose sum is σ = 86644422. Its totient is φ = 86644420.

The previous prime is 86644409. The next prime is 86644423. The reversal of 86644421 is 12444668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64224196 + 22420225 = 8014^2 + 4735^2 .

It is a cyclic number.

It is not a de Polignac number, because 86644421 - 2¹⁰ = 86643397 is a prime.

Together with 86644423, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86644423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43322210 + 43322211.

It is an arithmetic number, because the mean of its divisors is an integer number (43322211).

Almost surely, 2^86644421 is an apocalyptic number.

It is an amenable number.

86644421 is a deficient number, since it is larger than the sum of its proper divisors (1).

86644421 is an equidigital number, since it uses as much as digits as its factorization.

86644421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 35.

The square root of 86644421 is about 9308.2985018746. The cubic root of 86644421 is about 442.5002645045.

The spelling of 86644421 in words is "eighty-six million, six hundred forty-four thousand, four hundred twenty-one".