312211313 has 4 divisors (see below), whose sum is σ = 313796340. Its totient is φ = 310626288.

The previous prime is 312211309. The next prime is 312211327. The reversal of 312211313 is 313112213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313112213 = 277 ⋅1130369.

It can be written as a sum of positive squares in 2 ways, for example, as 193989184 + 118222129 = 13928^2 + 10873^2 .

It is a cyclic number.

It is not a de Polignac number, because 312211313 - 2² = 312211309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312211291 and 312211300.

It is not an unprimeable number, because it can be changed into a prime (312210313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792218 + ... + 792611.

It is an arithmetic number, because the mean of its divisors is an integer number (78449085).

Almost surely, 2^312211313 is an apocalyptic number.

It is an amenable number.

312211313 is a deficient number, since it is larger than the sum of its proper divisors (1585027).

312211313 is a wasteful number, since it uses less digits than its factorization.

312211313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585026.

The product of its digits is 108, while the sum is 17.

The square root of 312211313 is about 17669.5023416054. The cubic root of 312211313 is about 678.3953752144.

Adding to 312211313 its reverse (313112213), we get a palindrome (625323526).

The spelling of 312211313 in words is "three hundred twelve million, two hundred eleven thousand, three hundred thirteen".