86446721 has 2 divisors, whose sum is σ = 86446722. Its totient is φ = 86446720.

The previous prime is 86446697. The next prime is 86446729. The reversal of 86446721 is 12764468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54184321 + 32262400 = 7361^2 + 5680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86446721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86446729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43223360 + 43223361.

It is an arithmetic number, because the mean of its divisors is an integer number (43223361).

Almost surely, 2^86446721 is an apocalyptic number.

It is an amenable number.

86446721 is a deficient number, since it is larger than the sum of its proper divisors (1).

86446721 is an equidigital number, since it uses as much as digits as its factorization.

86446721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 38.

The square root of 86446721 is about 9297.6728808880. The cubic root of 86446721 is about 442.1634514201.

The spelling of 86446721 in words is "eighty-six million, four hundred forty-six thousand, seven hundred twenty-one".