84870641 has 2 divisors, whose sum is σ = 84870642. Its totient is φ = 84870640.

The previous prime is 84870629. The next prime is 84870679. The reversal of 84870641 is 14607848.

It is an a-pointer prime, because the next prime (84870679) can be obtained adding 84870641 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80013025 + 4857616 = 8945^2 + 2204^2 .

It is a cyclic number.

It is not a de Polignac number, because 84870641 - 2¹⁴ = 84854257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84870595 and 84870604.

It is not a weakly prime, because it can be changed into another prime (84870241) 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, 42435320 + 42435321.

It is an arithmetic number, because the mean of its divisors is an integer number (42435321).

Almost surely, 2^84870641 is an apocalyptic number.

It is an amenable number.

84870641 is a deficient number, since it is larger than the sum of its proper divisors (1).

84870641 is an equidigital number, since it uses as much as digits as its factorization.

84870641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 84870641 is about 9212.5263093247. The cubic root of 84870641 is about 439.4598071119.

The spelling of 84870641 in words is "eighty-four million, eight hundred seventy thousand, six hundred forty-one".