84556139 has 2 divisors, whose sum is σ = 84556140. Its totient is φ = 84556138.

The previous prime is 84556117. The next prime is 84556163. The reversal of 84556139 is 93165548.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84556139 - 2⁸ = 84555883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84556096 and 84556105.

It is not a weakly prime, because it can be changed into another prime (84556169) 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, 42278069 + 42278070.

It is an arithmetic number, because the mean of its divisors is an integer number (42278070).

Almost surely, 2^84556139 is an apocalyptic number.

84556139 is a deficient number, since it is larger than the sum of its proper divisors (1).

84556139 is an equidigital number, since it uses as much as digits as its factorization.

84556139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 41.

The square root of 84556139 is about 9195.4412074680. The cubic root of 84556139 is about 438.9163052206.

The spelling of 84556139 in words is "eighty-four million, five hundred fifty-six thousand, one hundred thirty-nine".