84170813 has 2 divisors, whose sum is σ = 84170814. Its totient is φ = 84170812.

The previous prime is 84170809. The next prime is 84170851. The reversal of 84170813 is 31807148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80317444 + 3853369 = 8962^2 + 1963^2 .

It is a cyclic number.

It is not a de Polignac number, because 84170813 - 2² = 84170809 is a prime.

It is a super-2 number, since 2×84170813² = 14169451522161938, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 84170813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84170803) 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, 42085406 + 42085407.

It is an arithmetic number, because the mean of its divisors is an integer number (42085407).

Almost surely, 2^84170813 is an apocalyptic number.

It is an amenable number.

84170813 is a deficient number, since it is larger than the sum of its proper divisors (1).

84170813 is an equidigital number, since it uses as much as digits as its factorization.

84170813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 84170813 is about 9174.4652705212. The cubic root of 84170813 is about 438.2485696654.

The spelling of 84170813 in words is "eighty-four million, one hundred seventy thousand, eight hundred thirteen".