85053509 has 2 divisors, whose sum is σ = 85053510. Its totient is φ = 85053508.

The previous prime is 85053497. The next prime is 85053511. The reversal of 85053509 is 90535058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80550625 + 4502884 = 8975^2 + 2122^2 .

It is a cyclic number.

It is not a de Polignac number, because 85053509 - 2¹² = 85049413 is a prime.

Together with 85053511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85053539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42526754 + 42526755.

It is an arithmetic number, because the mean of its divisors is an integer number (42526755).

Almost surely, 2^85053509 is an apocalyptic number.

It is an amenable number.

85053509 is a deficient number, since it is larger than the sum of its proper divisors (1).

85053509 is an equidigital number, since it uses as much as digits as its factorization.

85053509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 85053509 is about 9222.4459336989. The cubic root of 85053509 is about 439.7752105912.

The spelling of 85053509 in words is "eighty-five million, fifty-three thousand, five hundred nine".