31444730173 has 2 divisors, whose sum is σ = 31444730174. Its totient is φ = 31444730172.

The previous prime is 31444730137. The next prime is 31444730197. The reversal of 31444730173 is 37103744413.

Together with previous prime (31444730137) 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., 27733240089 + 3711490084 = 166533^2 + 60922^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31444730173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31444739173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15722365086 + 15722365087.

It is an arithmetic number, because the mean of its divisors is an integer number (15722365087).

Almost surely, 2^31444730173 is an apocalyptic number.

It is an amenable number.

31444730173 is a deficient number, since it is larger than the sum of its proper divisors (1).

31444730173 is an equidigital number, since it uses as much as digits as its factorization.

31444730173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 37.

The spelling of 31444730173 in words is "thirty-one billion, four hundred forty-four million, seven hundred thirty thousand, one hundred seventy-three".