86446781 has 2 divisors, whose sum is σ = 86446782. Its totient is φ = 86446780.

The previous prime is 86446747. The next prime is 86446783. The reversal of 86446781 is 18764468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83083225 + 3363556 = 9115^2 + 1834^2 .

It is a cyclic number.

It is not a de Polignac number, because 86446781 - 2¹⁰ = 86445757 is a prime.

It is a super-2 number, since 2×86446781² = 14946091890523922, which contains 22 as substring.

Together with 86446783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86446783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43223390 + 43223391.

It is an arithmetic number, because the mean of its divisors is an integer number (43223391).

Almost surely, 2^86446781 is an apocalyptic number.

It is an amenable number.

86446781 is a deficient number, since it is larger than the sum of its proper divisors (1).

86446781 is an equidigital number, since it uses as much as digits as its factorization.

86446781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 44.

The square root of 86446781 is about 9297.6761075013. The cubic root of 86446781 is about 442.1635537174.

The spelling of 86446781 in words is "eighty-six million, four hundred forty-six thousand, seven hundred eighty-one".