212456317 has 4 divisors (see below), whose sum is σ = 212683996. Its totient is φ = 212228640.

The previous prime is 212456303. The next prime is 212456329. The reversal of 212456317 is 713654212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 99480676 + 112975641 = 9974^2 + 10629^2 .

It is a cyclic number.

It is not a de Polignac number, because 212456317 - 2²³ = 204067709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212456417) 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, 112434 + ... + 114307.

It is an arithmetic number, because the mean of its divisors is an integer number (53170999).

Almost surely, 2^212456317 is an apocalyptic number.

It is an amenable number.

212456317 is a deficient number, since it is larger than the sum of its proper divisors (227679).

212456317 is an equidigital number, since it uses as much as digits as its factorization.

212456317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227678.

The product of its digits is 10080, while the sum is 31.

The square root of 212456317 is about 14575.8813455654. The cubic root of 212456317 is about 596.7007030232.

The spelling of 212456317 in words is "two hundred twelve million, four hundred fifty-six thousand, three hundred seventeen".