85811851 has 2 divisors, whose sum is σ = 85811852. Its totient is φ = 85811850.

The previous prime is 85811849. The next prime is 85811863. The reversal of 85811851 is 15811858.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85811851 - 2¹ = 85811849 is a prime.

Together with 85811849, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 85811851.

It is not a weakly prime, because it can be changed into another prime (85811651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42905925 + 42905926.

It is an arithmetic number, because the mean of its divisors is an integer number (42905926).

Almost surely, 2^85811851 is an apocalyptic number.

85811851 is a deficient number, since it is larger than the sum of its proper divisors (1).

85811851 is an equidigital number, since it uses as much as digits as its factorization.

85811851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12800, while the sum is 37.

The square root of 85811851 is about 9263.4686268158. The cubic root of 85811851 is about 441.0783656240.

Adding to 85811851 its product of digits (12800), we get a triangular number (85824651 = T₁₃₁₀₁).

The spelling of 85811851 in words is "eighty-five million, eight hundred eleven thousand, eight hundred fifty-one".