312216529 has 2 divisors, whose sum is σ = 312216530. Its totient is φ = 312216528.

The previous prime is 312216521. The next prime is 312216551. The reversal of 312216529 is 925612213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189117504 + 123099025 = 13752^2 + 11095^2 .

It is a cyclic number.

It is not a de Polignac number, because 312216529 - 2³ = 312216521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312216529.

It is not a weakly prime, because it can be changed into another prime (312216521) 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, 156108264 + 156108265.

It is an arithmetic number, because the mean of its divisors is an integer number (156108265).

Almost surely, 2^312216529 is an apocalyptic number.

It is an amenable number.

312216529 is a deficient number, since it is larger than the sum of its proper divisors (1).

312216529 is an equidigital number, since it uses as much as digits as its factorization.

312216529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 312216529 is about 17669.6499399394. The cubic root of 312216529 is about 678.3991530943.

The spelling of 312216529 in words is "three hundred twelve million, two hundred sixteen thousand, five hundred twenty-nine".