85874909 has 2 divisors, whose sum is σ = 85874910. Its totient is φ = 85874908.

The previous prime is 85874897. The next prime is 85874933. The reversal of 85874909 is 90947858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47472100 + 38402809 = 6890^2 + 6197^2 .

It is a cyclic number.

It is not a de Polignac number, because 85874909 - 2⁸ = 85874653 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85874989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42937454 + 42937455.

It is an arithmetic number, because the mean of its divisors is an integer number (42937455).

Almost surely, 2^85874909 is an apocalyptic number.

It is an amenable number.

85874909 is a deficient number, since it is larger than the sum of its proper divisors (1).

85874909 is an equidigital number, since it uses as much as digits as its factorization.

85874909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 85874909 is about 9266.8715864633. The cubic root of 85874909 is about 441.1863798792.

The spelling of 85874909 in words is "eighty-five million, eight hundred seventy-four thousand, nine hundred nine".