312223231 has 4 divisors (see below), whose sum is σ = 314212072. Its totient is φ = 310234392.

The previous prime is 312223211. The next prime is 312223237. The reversal of 312223231 is 132322213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 312223231 - 2⁵ = 312223199 is a prime.

It is a super-2 number, since 2×312223231² = 194966691952158722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312223199 and 312223208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312223237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 994185 + ... + 994498.

It is an arithmetic number, because the mean of its divisors is an integer number (78553018).

Almost surely, 2^312223231 is an apocalyptic number.

312223231 is a deficient number, since it is larger than the sum of its proper divisors (1988841).

312223231 is a wasteful number, since it uses less digits than its factorization.

312223231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988840.

The product of its digits is 432, while the sum is 19.

The square root of 312223231 is about 17669.8395861423. The cubic root of 312223231 is about 678.4040072027.

Adding to 312223231 its reverse (132322213), we get a palindrome (444545444).

It can be divided in two parts, 31222 and 3231, that added together give a triangular number (34453 = T₂₆₂).

The spelling of 312223231 in words is "three hundred twelve million, two hundred twenty-three thousand, two hundred thirty-one".