87331943173 has 2 divisors, whose sum is σ = 87331943174. Its totient is φ = 87331943172.

The previous prime is 87331943141. The next prime is 87331943183. The reversal of 87331943173 is 37134913378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82740796609 + 4591146564 = 287647^2 + 67758^2 .

It is a cyclic number.

It is not a de Polignac number, because 87331943173 - 2⁵ = 87331943141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87331943183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43665971586 + 43665971587.

It is an arithmetic number, because the mean of its divisors is an integer number (43665971587).

Almost surely, 2^87331943173 is an apocalyptic number.

It is an amenable number.

87331943173 is a deficient number, since it is larger than the sum of its proper divisors (1).

87331943173 is an equidigital number, since it uses as much as digits as its factorization.

87331943173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 49.

The spelling of 87331943173 in words is "eighty-seven billion, three hundred thirty-one million, nine hundred forty-three thousand, one hundred seventy-three".