85788761 has 2 divisors, whose sum is σ = 85788762. Its totient is φ = 85788760.

The previous prime is 85788739. The next prime is 85788779. The reversal of 85788761 is 16788758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80640400 + 5148361 = 8980^2 + 2269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85788761 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85788161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42894380 + 42894381.

It is an arithmetic number, because the mean of its divisors is an integer number (42894381).

Almost surely, 2^85788761 is an apocalyptic number.

It is an amenable number.

85788761 is a deficient number, since it is larger than the sum of its proper divisors (1).

85788761 is an equidigital number, since it uses as much as digits as its factorization.

85788761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 752640, while the sum is 50.

The square root of 85788761 is about 9262.2222495468. Note that the first 4 decimals coincide. The cubic root of 85788761 is about 441.0388007195.

The spelling of 85788761 in words is "eighty-five million, seven hundred eighty-eight thousand, seven hundred sixty-one".