31212003312173 has 2 divisors, whose sum is σ = 31212003312174. Its totient is φ = 31212003312172.

The previous prime is 31212003312157. The next prime is 31212003312221. The reversal of 31212003312173 is 37121330021213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25716481184164 + 5495522128009 = 5071142^2 + 2344253^2 .

It is a cyclic number.

It is not a de Polignac number, because 31212003312173 - 2⁴ = 31212003312157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212003312473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606001656086 + 15606001656087.

It is an arithmetic number, because the mean of its divisors is an integer number (15606001656087).

Almost surely, 2^{31212003312173} is an apocalyptic number.

It is an amenable number.

31212003312173 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212003312173 is an equidigital number, since it uses as much as digits as its factorization.

31212003312173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

Adding to 31212003312173 its reverse (37121330021213), we get a palindrome (68333333333386).

The spelling of 31212003312173 in words is "thirty-one trillion, two hundred twelve billion, three million, three hundred twelve thousand, one hundred seventy-three".