85606909 has 2 divisors, whose sum is σ = 85606910. Its totient is φ = 85606908.

The previous prime is 85606891. The next prime is 85606949. The reversal of 85606909 is 90960658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54804409 + 30802500 = 7403^2 + 5550^2 .

It is a cyclic number.

It is not a de Polignac number, because 85606909 - 2⁵ = 85606877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85606949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42803454 + 42803455.

It is an arithmetic number, because the mean of its divisors is an integer number (42803455).

Almost surely, 2^85606909 is an apocalyptic number.

It is an amenable number.

85606909 is a deficient number, since it is larger than the sum of its proper divisors (1).

85606909 is an equidigital number, since it uses as much as digits as its factorization.

85606909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 85606909 is about 9252.4001750897. The cubic root of 85606909 is about 440.7269474147.

The spelling of 85606909 in words is "eighty-five million, six hundred six thousand, nine hundred nine".