86671609 has 2 divisors, whose sum is σ = 86671610. Its totient is φ = 86671608.

The previous prime is 86671601. The next prime is 86671631. The reversal of 86671609 is 90617668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73188025 + 13483584 = 8555^2 + 3672^2 .

It is a cyclic number.

It is not a de Polignac number, because 86671609 - 2³ = 86671601 is a prime.

It is not a weakly prime, because it can be changed into another prime (86671601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43335804 + 43335805.

It is an arithmetic number, because the mean of its divisors is an integer number (43335805).

Almost surely, 2^86671609 is an apocalyptic number.

It is an amenable number.

86671609 is a deficient number, since it is larger than the sum of its proper divisors (1).

86671609 is an equidigital number, since it uses as much as digits as its factorization.

86671609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 86671609 is about 9309.7588046093. The cubic root of 86671609 is about 442.5465434567.

The spelling of 86671609 in words is "eighty-six million, six hundred seventy-one thousand, six hundred nine".