85358509 has 2 divisors, whose sum is σ = 85358510. Its totient is φ = 85358508.

The previous prime is 85358503. The next prime is 85358521. The reversal of 85358509 is 90585358.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72420100 + 12938409 = 8510^2 + 3597^2 .

It is a cyclic number.

It is not a de Polignac number, because 85358509 - 2¹¹ = 85356461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85358503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42679254 + 42679255.

It is an arithmetic number, because the mean of its divisors is an integer number (42679255).

Almost surely, 2^85358509 is an apocalyptic number.

It is an amenable number.

85358509 is a deficient number, since it is larger than the sum of its proper divisors (1).

85358509 is an equidigital number, since it uses as much as digits as its factorization.

85358509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216000, while the sum is 43.

The square root of 85358509 is about 9238.9668794731. The cubic root of 85358509 is about 440.3002582100.

The spelling of 85358509 in words is "eighty-five million, three hundred fifty-eight thousand, five hundred nine".