312304561 has 2 divisors, whose sum is σ = 312304562. Its totient is φ = 312304560.

The previous prime is 312304543. The next prime is 312304609. The reversal of 312304561 is 165403213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 263737600 + 48566961 = 16240^2 + 6969^2 .

It is an emirp because it is prime and its reverse (165403213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312304561 - 2²¹ = 310207409 is a prime.

It is not a weakly prime, because it can be changed into another prime (312304061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156152280 + 156152281.

It is an arithmetic number, because the mean of its divisors is an integer number (156152281).

Almost surely, 2^312304561 is an apocalyptic number.

It is an amenable number.

312304561 is a deficient number, since it is larger than the sum of its proper divisors (1).

312304561 is an equidigital number, since it uses as much as digits as its factorization.

312304561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 312304561 is about 17672.1408154191. The cubic root of 312304561 is about 678.4629071631.

Adding to 312304561 its reverse (165403213), we get a palindrome (477707774).

The spelling of 312304561 in words is "three hundred twelve million, three hundred four thousand, five hundred sixty-one".