85009549 has 2 divisors, whose sum is σ = 85009550. Its totient is φ = 85009548.

The previous prime is 85009543. The next prime is 85009559. The reversal of 85009549 is 94590058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84971524 + 38025 = 9218^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 85009549 - 2⁵ = 85009517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85009543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42504774 + 42504775.

It is an arithmetic number, because the mean of its divisors is an integer number (42504775).

Almost surely, 2^85009549 is an apocalyptic number.

It is an amenable number.

85009549 is a deficient number, since it is larger than the sum of its proper divisors (1).

85009549 is an equidigital number, since it uses as much as digits as its factorization.

85009549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 85009549 is about 9220.0623099847. The cubic root of 85009549 is about 439.6994314332.

It can be divided in two parts, 85009 and 549, that added together give a palindrome (85558).

The spelling of 85009549 in words is "eighty-five million, nine thousand, five hundred forty-nine".