312549821 has 2 divisors, whose sum is σ = 312549822. Its totient is φ = 312549820.

The previous prime is 312549817. The next prime is 312549827. The reversal of 312549821 is 128945213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310147321 + 2402500 = 17611^2 + 1550^2 .

It is a cyclic number.

It is not a de Polignac number, because 312549821 - 2² = 312549817 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312549827) 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, 156274910 + 156274911.

It is an arithmetic number, because the mean of its divisors is an integer number (156274911).

Almost surely, 2^312549821 is an apocalyptic number.

It is an amenable number.

312549821 is a deficient number, since it is larger than the sum of its proper divisors (1).

312549821 is an equidigital number, since it uses as much as digits as its factorization.

312549821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 312549821 is about 17679.0786241817. The cubic root of 312549821 is about 678.6404648991.

The spelling of 312549821 in words is "three hundred twelve million, five hundred forty-nine thousand, eight hundred twenty-one".