86140709 has 2 divisors, whose sum is σ = 86140710. Its totient is φ = 86140708.

The previous prime is 86140673. The next prime is 86140711. The reversal of 86140709 is 90704168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82864609 + 3276100 = 9103^2 + 1810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86140709 is a prime.

It is a Sophie Germain prime.

Together with 86140711, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86140009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43070354 + 43070355.

It is an arithmetic number, because the mean of its divisors is an integer number (43070355).

Almost surely, 2^86140709 is an apocalyptic number.

It is an amenable number.

86140709 is a deficient number, since it is larger than the sum of its proper divisors (1).

86140709 is an equidigital number, since it uses as much as digits as its factorization.

86140709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 86140709 is about 9281.2019157004. The cubic root of 86140709 is about 441.6410977168.

The spelling of 86140709 in words is "eighty-six million, one hundred forty thousand, seven hundred nine".