85866749 has 2 divisors, whose sum is σ = 85866750. Its totient is φ = 85866748.

The previous prime is 85866727. The next prime is 85866787. The reversal of 85866749 is 94766858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77352025 + 8514724 = 8795^2 + 2918^2 .

It is a cyclic number.

It is not a de Polignac number, because 85866749 - 2¹⁶ = 85801213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85866749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85866349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42933374 + 42933375.

It is an arithmetic number, because the mean of its divisors is an integer number (42933375).

Almost surely, 2^85866749 is an apocalyptic number.

It is an amenable number.

85866749 is a deficient number, since it is larger than the sum of its proper divisors (1).

85866749 is an equidigital number, since it uses as much as digits as its factorization.

85866749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 53.

The square root of 85866749 is about 9266.4312979701. The cubic root of 85866749 is about 441.1724053088.

The spelling of 85866749 in words is "eighty-five million, eight hundred sixty-six thousand, seven hundred forty-nine".