84855851 has 2 divisors, whose sum is σ = 84855852. Its totient is φ = 84855850.

The previous prime is 84855847. The next prime is 84855853. The reversal of 84855851 is 15855848.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84855851 - 2² = 84855847 is a prime.

Together with 84855853, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84855853) 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, 42427925 + 42427926.

It is an arithmetic number, because the mean of its divisors is an integer number (42427926).

Almost surely, 2^84855851 is an apocalyptic number.

84855851 is a deficient number, since it is larger than the sum of its proper divisors (1).

84855851 is an equidigital number, since it uses as much as digits as its factorization.

84855851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 256000, while the sum is 44.

The square root of 84855851 is about 9211.7235629387. The cubic root of 84855851 is about 439.4342781105.

The spelling of 84855851 in words is "eighty-four million, eight hundred fifty-five thousand, eight hundred fifty-one".