86640137 has 2 divisors, whose sum is σ = 86640138. Its totient is φ = 86640136.

The previous prime is 86640121. The next prime is 86640161. The reversal of 86640137 is 73104668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71554681 + 15085456 = 8459^2 + 3884^2 .

It is a cyclic number.

It is not a de Polignac number, because 86640137 - 2⁴ = 86640121 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 86640097 and 86640106.

It is not a weakly prime, because it can be changed into another prime (86660137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43320068 + 43320069.

It is an arithmetic number, because the mean of its divisors is an integer number (43320069).

Almost surely, 2^86640137 is an apocalyptic number.

It is an amenable number.

86640137 is a deficient number, since it is larger than the sum of its proper divisors (1).

86640137 is an equidigital number, since it uses as much as digits as its factorization.

86640137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 86640137 is about 9308.0683817858. The cubic root of 86640137 is about 442.4929714695.

The spelling of 86640137 in words is "eighty-six million, six hundred forty thousand, one hundred thirty-seven".