84631712173 has 2 divisors, whose sum is σ = 84631712174. Its totient is φ = 84631712172.

The previous prime is 84631712171. The next prime is 84631712251. The reversal of 84631712173 is 37121713648.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43291876489 + 41339835684 = 208067^2 + 203322^2 .

It is a cyclic number.

It is not a de Polignac number, because 84631712173 - 2¹ = 84631712171 is a prime.

Together with 84631712171, 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 (84631712171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42315856086 + 42315856087.

It is an arithmetic number, because the mean of its divisors is an integer number (42315856087).

Almost surely, 2^84631712173 is an apocalyptic number.

It is an amenable number.

84631712173 is a deficient number, since it is larger than the sum of its proper divisors (1).

84631712173 is an equidigital number, since it uses as much as digits as its factorization.

84631712173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 43.

The spelling of 84631712173 in words is "eighty-four billion, six hundred thirty-one million, seven hundred twelve thousand, one hundred seventy-three".