85507769 has 2 divisors, whose sum is σ = 85507770. Its totient is φ = 85507768.

The previous prime is 85507753. The next prime is 85507801. The reversal of 85507769 is 96770558.

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., 63792169 + 21715600 = 7987^2 + 4660^2 .

It is a cyclic number.

It is not a de Polignac number, because 85507769 - 2⁴ = 85507753 is a prime.

It is a super-2 number, since 2×85507769² = 14623157118714722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (85507369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42753884 + 42753885.

It is an arithmetic number, because the mean of its divisors is an integer number (42753885).

Almost surely, 2^85507769 is an apocalyptic number.

It is an amenable number.

85507769 is a deficient number, since it is larger than the sum of its proper divisors (1).

85507769 is an equidigital number, since it uses as much as digits as its factorization.

85507769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 529200, while the sum is 47.

The square root of 85507769 is about 9247.0410943177. The cubic root of 85507769 is about 440.5567487399.

The spelling of 85507769 in words is "eighty-five million, five hundred seven thousand, seven hundred sixty-nine".