84870217 has 2 divisors, whose sum is σ = 84870218. Its totient is φ = 84870216.

The previous prime is 84870197. The next prime is 84870223. The reversal of 84870217 is 71207848.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62031376 + 22838841 = 7876^2 + 4779^2 .

It is a cyclic number.

It is not a de Polignac number, because 84870217 - 2¹⁵ = 84837449 is a prime.

It is not a weakly prime, because it can be changed into another prime (84870257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42435108 + 42435109.

It is an arithmetic number, because the mean of its divisors is an integer number (42435109).

Almost surely, 2^84870217 is an apocalyptic number.

It is an amenable number.

84870217 is a deficient number, since it is larger than the sum of its proper divisors (1).

84870217 is an equidigital number, since it uses as much as digits as its factorization.

84870217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 84870217 is about 9212.5032971500. The cubic root of 84870217 is about 439.4590752873.

The spelling of 84870217 in words is "eighty-four million, eight hundred seventy thousand, two hundred seventeen".