84784813 has 2 divisors, whose sum is σ = 84784814. Its totient is φ = 84784812.

The previous prime is 84784811. The next prime is 84784841. The reversal of 84784813 is 31848748.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83868964 + 915849 = 9158^2 + 957^2 .

It is a cyclic number.

It is not a de Polignac number, because 84784813 - 2¹ = 84784811 is a prime.

Together with 84784811, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 84784813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84784811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42392406 + 42392407.

It is an arithmetic number, because the mean of its divisors is an integer number (42392407).

Almost surely, 2^84784813 is an apocalyptic number.

It is an amenable number.

84784813 is a deficient number, since it is larger than the sum of its proper divisors (1).

84784813 is an equidigital number, since it uses as much as digits as its factorization.

84784813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172032, while the sum is 43.

The square root of 84784813 is about 9207.8669082475. The cubic root of 84784813 is about 439.3116181446.

The spelling of 84784813 in words is "eighty-four million, seven hundred eighty-four thousand, eight hundred thirteen".