31320000123173 has 2 divisors, whose sum is σ = 31320000123174. Its totient is φ = 31320000123172.

The previous prime is 31320000123131. The next prime is 31320000123211. The reversal of 31320000123173 is 37132100002313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28149741530689 + 3170258592484 = 5305633^2 + 1780522^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320000123173 - 2²⁶ = 31319933014309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31320000123073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660000061586 + 15660000061587.

It is an arithmetic number, because the mean of its divisors is an integer number (15660000061587).

Almost surely, 2^{31320000123173} is an apocalyptic number.

It is an amenable number.

31320000123173 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320000123173 is an equidigital number, since it uses as much as digits as its factorization.

31320000123173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 26.

Adding to 31320000123173 its reverse (37132100002313), we get a palindrome (68452100125486).

The spelling of 31320000123173 in words is "thirty-one trillion, three hundred twenty billion, one hundred twenty-three thousand, one hundred seventy-three".