312485009 has 2 divisors, whose sum is σ = 312485010. Its totient is φ = 312485008.

The previous prime is 312484981. The next prime is 312485021. The reversal of 312485009 is 900584213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 306250000 + 6235009 = 17500^2 + 2497^2 .

It is an emirp because it is prime and its reverse (900584213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312485009 - 2¹² = 312480913 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_16891511 and since 312485009 and 16891511 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (312485099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156242504 + 156242505.

It is an arithmetic number, because the mean of its divisors is an integer number (156242505).

Almost surely, 2^312485009 is an apocalyptic number.

It is an amenable number.

312485009 is a deficient number, since it is larger than the sum of its proper divisors (1).

312485009 is an equidigital number, since it uses as much as digits as its factorization.

312485009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 312485009 is about 17677.2455150682. The cubic root of 312485009 is about 678.5935528193.

The spelling of 312485009 in words is "three hundred twelve million, four hundred eighty-five thousand, nine".