85250813 has 2 divisors, whose sum is σ = 85250814. Its totient is φ = 85250812.

The previous prime is 85250791. The next prime is 85250827. The reversal of 85250813 is 31805258.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81036004 + 4214809 = 9002^2 + 2053^2 .

It is a cyclic number.

It is not a de Polignac number, because 85250813 - 2¹⁶ = 85185277 is a prime.

It is a super-2 number, since 2×85250813² = 14535402234321938, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 85250813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85250833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42625406 + 42625407.

It is an arithmetic number, because the mean of its divisors is an integer number (42625407).

Almost surely, 2^85250813 is an apocalyptic number.

It is an amenable number.

85250813 is a deficient number, since it is larger than the sum of its proper divisors (1).

85250813 is an equidigital number, since it uses as much as digits as its factorization.

85250813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 85250813 is about 9233.1366826231. The cubic root of 85250813 is about 440.1150060944.

The spelling of 85250813 in words is "eighty-five million, two hundred fifty thousand, eight hundred thirteen".