85785533 has 2 divisors, whose sum is σ = 85785534. Its totient is φ = 85785532.

The previous prime is 85785523. The next prime is 85785541. The reversal of 85785533 is 33558758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85340644 + 444889 = 9238^2 + 667^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85785533 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85785503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42892766 + 42892767.

It is an arithmetic number, because the mean of its divisors is an integer number (42892767).

Almost surely, 2^85785533 is an apocalyptic number.

It is an amenable number.

85785533 is a deficient number, since it is larger than the sum of its proper divisors (1).

85785533 is an equidigital number, since it uses as much as digits as its factorization.

85785533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504000, while the sum is 44.

The square root of 85785533 is about 9262.0479916701. The cubic root of 85785533 is about 441.0332689494.

The spelling of 85785533 in words is "eighty-five million, seven hundred eighty-five thousand, five hundred thirty-three".