86279909 has 2 divisors, whose sum is σ = 86279910. Its totient is φ = 86279908.

The previous prime is 86279903. The next prime is 86279917. The reversal of 86279909 is 90997268.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85562500 + 717409 = 9250^2 + 847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86279909 is a prime.

It is a Sophie Germain prime.

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 (86279903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43139954 + 43139955.

It is an arithmetic number, because the mean of its divisors is an integer number (43139955).

Almost surely, 2^86279909 is an apocalyptic number.

It is an amenable number.

86279909 is a deficient number, since it is larger than the sum of its proper divisors (1).

86279909 is an equidigital number, since it uses as much as digits as its factorization.

86279909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 86279909 is about 9288.6979173617. The cubic root of 86279909 is about 441.8788612424.

The spelling of 86279909 in words is "eighty-six million, two hundred seventy-nine thousand, nine hundred nine".