312213173 has 2 divisors, whose sum is σ = 312213174. Its totient is φ = 312213172.

The previous prime is 312213163. The next prime is 312213203. The reversal of 312213173 is 371312213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254179249 + 58033924 = 15943^2 + 7618^2 .

It is a cyclic number.

It is not a de Polignac number, because 312213173 - 2²⁴ = 295435957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312213163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156106586 + 156106587.

It is an arithmetic number, because the mean of its divisors is an integer number (156106587).

Almost surely, 2^312213173 is an apocalyptic number.

It is an amenable number.

312213173 is a deficient number, since it is larger than the sum of its proper divisors (1).

312213173 is an equidigital number, since it uses as much as digits as its factorization.

312213173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 23.

The square root of 312213173 is about 17669.5549745884. The cubic root of 312213173 is about 678.3967223927.

Adding to 312213173 its reverse (371312213), we get a palindrome (683525386).

The spelling of 312213173 in words is "three hundred twelve million, two hundred thirteen thousand, one hundred seventy-three".