312229 has 2 divisors, whose sum is σ = 312230. Its totient is φ = 312228.

The previous prime is 312217. The next prime is 312233. The reversal of 312229 is 922213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 280900 + 31329 = 530^2 + 177^2 .

It is a cyclic number.

It is not a de Polignac number, because 312229 - 2⁵ = 312197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156114 + 156115.

It is an arithmetic number, because the mean of its divisors is an integer number (156115).

2³¹²²²⁹ is an apocalyptic number.

It is an amenable number.

312229 is a deficient number, since it is larger than the sum of its proper divisors (1).

312229 is an equidigital number, since it uses as much as digits as its factorization.

312229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 19.

The square root of 312229 is about 558.7745520333. The cubic root of 312229 is about 67.8408185504.

Adding to 312229 its product of digits (216), we get a triangular number (312445 = T₇₉₀).

The spelling of 312229 in words is "three hundred twelve thousand, two hundred twenty-nine".