312505489 has 2 divisors, whose sum is σ = 312505490. Its totient is φ = 312505488.

The previous prime is 312505469. The next prime is 312505493. The reversal of 312505489 is 984505213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200505600 + 111999889 = 14160^2 + 10583^2 .

It is a cyclic number.

It is not a de Polignac number, because 312505489 - 2⁹ = 312504977 is a prime.

It is not a weakly prime, because it can be changed into another prime (312505409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156252744 + 156252745.

It is an arithmetic number, because the mean of its divisors is an integer number (156252745).

Almost surely, 2^312505489 is an apocalyptic number.

It is an amenable number.

312505489 is a deficient number, since it is larger than the sum of its proper divisors (1).

312505489 is an equidigital number, since it uses as much as digits as its factorization.

312505489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 312505489 is about 17677.8247813468. The cubic root of 312505489 is about 678.6083773090.

The spelling of 312505489 in words is "three hundred twelve million, five hundred five thousand, four hundred eighty-nine".