85811983 has 2 divisors, whose sum is σ = 85811984. Its totient is φ = 85811982.

The previous prime is 85811981. The next prime is 85811993. The reversal of 85811983 is 38911858.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85811983 - 2¹ = 85811981 is a prime.

Together with 85811981, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85811981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42905991 + 42905992.

It is an arithmetic number, because the mean of its divisors is an integer number (42905992).

Almost surely, 2^85811983 is an apocalyptic number.

85811983 is a deficient number, since it is larger than the sum of its proper divisors (1).

85811983 is an equidigital number, since it uses as much as digits as its factorization.

85811983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 43.

The square root of 85811983 is about 9263.4757515740. The cubic root of 85811983 is about 441.0785917867.

The spelling of 85811983 in words is "eighty-five million, eight hundred eleven thousand, nine hundred eighty-three".