86643761 has 2 divisors, whose sum is σ = 86643762. Its totient is φ = 86643760.

The previous prime is 86643731. The next prime is 86643769. The reversal of 86643761 is 16734668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85673536 + 970225 = 9256^2 + 985^2 .

It is a cyclic number.

It is not a de Polignac number, because 86643761 - 2¹⁴ = 86627377 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86643769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43321880 + 43321881.

It is an arithmetic number, because the mean of its divisors is an integer number (43321881).

Almost surely, 2^86643761 is an apocalyptic number.

It is an amenable number.

86643761 is a deficient number, since it is larger than the sum of its proper divisors (1).

86643761 is an equidigital number, since it uses as much as digits as its factorization.

86643761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 86643761 is about 9308.2630495705. The cubic root of 86643761 is about 442.4991409434.

The spelling of 86643761 in words is "eighty-six million, six hundred forty-three thousand, seven hundred sixty-one".