313212217 has 4 divisors (see below), whose sum is σ = 313580260. Its totient is φ = 312844176.

The previous prime is 313212077. The next prime is 313212227. The reversal of 313212217 is 712212313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712212313 = 10867 ⋅65539.

It can be written as a sum of positive squares in 2 ways, for example, as 112593321 + 200618896 = 10611^2 + 14164^2 .

It is a cyclic number.

It is not a de Polignac number, because 313212217 - 2¹¹ = 313210169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (313212227) 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, 182742 + ... + 184447.

It is an arithmetic number, because the mean of its divisors is an integer number (78395065).

Almost surely, 2^313212217 is an apocalyptic number.

It is an amenable number.

313212217 is a deficient number, since it is larger than the sum of its proper divisors (368043).

313212217 is an equidigital number, since it uses as much as digits as its factorization.

313212217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368042.

The product of its digits is 504, while the sum is 22.

The square root of 313212217 is about 17697.8026037133. The cubic root of 313212217 is about 679.1195474924.

The spelling of 313212217 in words is "three hundred thirteen million, two hundred twelve thousand, two hundred seventeen".