31210130173 has 2 divisors, whose sum is σ = 31210130174. Its totient is φ = 31210130172.

The previous prime is 31210130137. The next prime is 31210130179. The reversal of 31210130173 is 37103101213.

Together with previous prime (31210130137) 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., 21417444409 + 9792685764 = 146347^2 + 98958^2 .

It is a cyclic number.

It is not a de Polignac number, because 31210130173 - 2¹⁷ = 31209999101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31210130179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605065086 + 15605065087.

It is an arithmetic number, because the mean of its divisors is an integer number (15605065087).

Almost surely, 2^31210130173 is an apocalyptic number.

It is an amenable number.

31210130173 is a deficient number, since it is larger than the sum of its proper divisors (1).

31210130173 is an equidigital number, since it uses as much as digits as its factorization.

31210130173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 22.

Adding to 31210130173 its reverse (37103101213), we get a palindrome (68313231386).

The spelling of 31210130173 in words is "thirty-one billion, two hundred ten million, one hundred thirty thousand, one hundred seventy-three".