85099009 has 2 divisors, whose sum is σ = 85099010. Its totient is φ = 85099008.

The previous prime is 85098983. The next prime is 85099013. The reversal of 85099009 is 90099058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76947984 + 8151025 = 8772^2 + 2855^2 .

It is a cyclic number.

It is not a de Polignac number, because 85099009 - 2¹¹ = 85096961 is a prime.

It is not a weakly prime, because it can be changed into another prime (85099019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42549504 + 42549505.

It is an arithmetic number, because the mean of its divisors is an integer number (42549505).

Almost surely, 2^85099009 is an apocalyptic number.

It is an amenable number.

85099009 is a deficient number, since it is larger than the sum of its proper divisors (1).

85099009 is an equidigital number, since it uses as much as digits as its factorization.

85099009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 85099009 is about 9224.9124115083. The cubic root of 85099009 is about 439.8536169390.

The spelling of 85099009 in words is "eighty-five million, ninety-nine thousand, nine".