84770813 has 2 divisors, whose sum is σ = 84770814. Its totient is φ = 84770812.

The previous prime is 84770773. The next prime is 84770827. The reversal of 84770813 is 31807748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83576164 + 1194649 = 9142^2 + 1093^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84770813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84770843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42385406 + 42385407.

It is an arithmetic number, because the mean of its divisors is an integer number (42385407).

Almost surely, 2^84770813 is an apocalyptic number.

It is an amenable number.

84770813 is a deficient number, since it is larger than the sum of its proper divisors (1).

84770813 is an equidigital number, since it uses as much as digits as its factorization.

84770813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 84770813 is about 9207.1066573598. The cubic root of 84770813 is about 439.2874365292.

The spelling of 84770813 in words is "eighty-four million, seven hundred seventy thousand, eight hundred thirteen".