85864549 has 2 divisors, whose sum is σ = 85864550. Its totient is φ = 85864548.

The previous prime is 85864517. The next prime is 85864577. The reversal of 85864549 is 94546858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84971524 + 893025 = 9218^2 + 945^2 .

It is a cyclic number.

It is not a de Polignac number, because 85864549 - 2⁵ = 85864517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85864949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42932274 + 42932275.

It is an arithmetic number, because the mean of its divisors is an integer number (42932275).

Almost surely, 2^85864549 is an apocalyptic number.

It is an amenable number.

85864549 is a deficient number, since it is larger than the sum of its proper divisors (1).

85864549 is an equidigital number, since it uses as much as digits as its factorization.

85864549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382400, while the sum is 49.

The square root of 85864549 is about 9266.3125891586. The cubic root of 85864549 is about 441.1686375035.

The spelling of 85864549 in words is "eighty-five million, eight hundred sixty-four thousand, five hundred forty-nine".