84913678309 has 2 divisors, whose sum is σ = 84913678310. Its totient is φ = 84913678308.

The previous prime is 84913678307. The next prime is 84913678321. The reversal of 84913678309 is 90387631948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80210736225 + 4702942084 = 283215^2 + 68578^2 .

It is a cyclic number.

It is not a de Polignac number, because 84913678309 - 2¹ = 84913678307 is a prime.

Together with 84913678307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84913678307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42456839154 + 42456839155.

It is an arithmetic number, because the mean of its divisors is an integer number (42456839155).

Almost surely, 2^84913678309 is an apocalyptic number.

It is an amenable number.

84913678309 is a deficient number, since it is larger than the sum of its proper divisors (1).

84913678309 is an equidigital number, since it uses as much as digits as its factorization.

84913678309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7838208, while the sum is 58.

The spelling of 84913678309 in words is "eighty-four billion, nine hundred thirteen million, six hundred seventy-eight thousand, three hundred nine".