85783891 has 2 divisors, whose sum is σ = 85783892. Its totient is φ = 85783890.

The previous prime is 85783889. The next prime is 85783937. The reversal of 85783891 is 19838758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85783891 - 2¹ = 85783889 is a prime.

Together with 85783889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (85783861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42891945 + 42891946.

It is an arithmetic number, because the mean of its divisors is an integer number (42891946).

Almost surely, 2^85783891 is an apocalyptic number.

85783891 is a deficient number, since it is larger than the sum of its proper divisors (1).

85783891 is an equidigital number, since it uses as much as digits as its factorization.

85783891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 49.

The square root of 85783891 is about 9261.9593499432. The cubic root of 85783891 is about 441.0304550280.

It can be divided in two parts, 857 and 83891, that added together give a palindrome (84748).

The spelling of 85783891 in words is "eighty-five million, seven hundred eighty-three thousand, eight hundred ninety-one".