84871243 has 2 divisors, whose sum is σ = 84871244. Its totient is φ = 84871242.

The previous prime is 84871231. The next prime is 84871253. The reversal of 84871243 is 34217848.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84871243 is a prime.

It is not a weakly prime, because it can be changed into another prime (84871253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42435621 + 42435622.

It is an arithmetic number, because the mean of its divisors is an integer number (42435622).

Almost surely, 2^84871243 is an apocalyptic number.

84871243 is a deficient number, since it is larger than the sum of its proper divisors (1).

84871243 is an equidigital number, since it uses as much as digits as its factorization.

84871243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 37.

The square root of 84871243 is about 9212.5589821721. The cubic root of 84871243 is about 439.4608461606.

It can be divided in two parts, 8487 and 1243, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 84871243 in words is "eighty-four million, eight hundred seventy-one thousand, two hundred forty-three".