84904396813 has 2 divisors, whose sum is σ = 84904396814. Its totient is φ = 84904396812.

The previous prime is 84904396789. The next prime is 84904396831. The reversal of 84904396813 is 31869340948.

Together with next prime (84904396831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67643166889 + 17261229924 = 260083^2 + 131382^2 .

It is a cyclic number.

It is not a de Polignac number, because 84904396813 - 2²⁹ = 84367525901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84904396853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42452198406 + 42452198407.

It is an arithmetic number, because the mean of its divisors is an integer number (42452198407).

Almost surely, 2^84904396813 is an apocalyptic number.

It is an amenable number.

84904396813 is a deficient number, since it is larger than the sum of its proper divisors (1).

84904396813 is an equidigital number, since it uses as much as digits as its factorization.

84904396813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 84904396813 in words is "eighty-four billion, nine hundred four million, three hundred ninety-six thousand, eight hundred thirteen".