86806409 has 2 divisors, whose sum is σ = 86806410. Its totient is φ = 86806408.

The previous prime is 86806373. The next prime is 86806451. The reversal of 86806409 is 90460868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78712384 + 8094025 = 8872^2 + 2845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86806409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86806469) 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, 43403204 + 43403205.

It is an arithmetic number, because the mean of its divisors is an integer number (43403205).

Almost surely, 2^86806409 is an apocalyptic number.

It is an amenable number.

86806409 is a deficient number, since it is larger than the sum of its proper divisors (1).

86806409 is an equidigital number, since it uses as much as digits as its factorization.

86806409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 86806409 is about 9316.9957067716. The cubic root of 86806409 is about 442.7758548934.

The spelling of 86806409 in words is "eighty-six million, eight hundred six thousand, four hundred nine".