312730009 has 2 divisors, whose sum is σ = 312730010. Its totient is φ = 312730008.

The previous prime is 312730003. The next prime is 312730021. The reversal of 312730009 is 900037213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207216025 + 105513984 = 14395^2 + 10272^2 .

It is an emirp because it is prime and its reverse (900037213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312730009 - 2¹⁹ = 312205721 is a prime.

It is not a weakly prime, because it can be changed into another prime (312730003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156365004 + 156365005.

It is an arithmetic number, because the mean of its divisors is an integer number (156365005).

Almost surely, 2^312730009 is an apocalyptic number.

It is an amenable number.

312730009 is a deficient number, since it is larger than the sum of its proper divisors (1).

312730009 is an equidigital number, since it uses as much as digits as its factorization.

312730009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 312730009 is about 17684.1739699653. The cubic root of 312730009 is about 678.7708541132.

The spelling of 312730009 in words is "three hundred twelve million, seven hundred thirty thousand, nine".