84121859 has 2 divisors, whose sum is σ = 84121860. Its totient is φ = 84121858.

The previous prime is 84121847. The next prime is 84121861. The reversal of 84121859 is 95812148.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84121859 - 2²⁴ = 67344643 is a prime.

Together with 84121861, 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 (84121159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42060929 + 42060930.

It is an arithmetic number, because the mean of its divisors is an integer number (42060930).

Almost surely, 2^84121859 is an apocalyptic number.

84121859 is a deficient number, since it is larger than the sum of its proper divisors (1).

84121859 is an equidigital number, since it uses as much as digits as its factorization.

84121859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 38.

The square root of 84121859 is about 9171.7969340800. The cubic root of 84121859 is about 438.1635909565.

The spelling of 84121859 in words is "eighty-four million, one hundred twenty-one thousand, eight hundred fifty-nine".