312214381 has 2 divisors, whose sum is σ = 312214382. Its totient is φ = 312214380.

The previous prime is 312214313. The next prime is 312214391. The reversal of 312214381 is 183412213.

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., 277522281 + 34692100 = 16659^2 + 5890^2 .

It is a cyclic number.

It is not a de Polignac number, because 312214381 - 2¹⁵ = 312181613 is a prime.

It is a super-2 number, since 2×312214381² = 194955639406426322, which contains 22 as substring.

It is a zygodrome in base 5.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312214391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156107190 + 156107191.

It is an arithmetic number, because the mean of its divisors is an integer number (156107191).

Almost surely, 2^312214381 is an apocalyptic number.

It is an amenable number.

312214381 is a deficient number, since it is larger than the sum of its proper divisors (1).

312214381 is an equidigital number, since it uses as much as digits as its factorization.

312214381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

The square root of 312214381 is about 17669.5891576460. The cubic root of 312214381 is about 678.3975973314.

Adding to 312214381 its reverse (183412213), we get a palindrome (495626594).

The spelling of 312214381 in words is "three hundred twelve million, two hundred fourteen thousand, three hundred eighty-one".