312281 has 2 divisors, whose sum is σ = 312282. Its totient is φ = 312280.

The previous prime is 312269. The next prime is 312283. The reversal of 312281 is 182213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 292681 + 19600 = 541^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 312281 - 2⁶ = 312217 is a prime.

It is a super-2 number, since 2×312281² = 195038845922, which contains 22 as substring.

Together with 312283, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 312281.

It is not a weakly prime, because it can be changed into another prime (312283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156140 + 156141.

It is an arithmetic number, because the mean of its divisors is an integer number (156141).

2³¹²²⁸¹ is an apocalyptic number.

It is an amenable number.

312281 is a deficient number, since it is larger than the sum of its proper divisors (1).

312281 is an equidigital number, since it uses as much as digits as its factorization.

312281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 17.

The square root of 312281 is about 558.8210804900. The cubic root of 312281 is about 67.8445845115.

Adding to 312281 its reverse (182213), we get a palindrome (494494).

The spelling of 312281 in words is "three hundred twelve thousand, two hundred eighty-one".