309272473 has 2 divisors, whose sum is σ = 309272474. Its totient is φ = 309272472.

The previous prime is 309272459. The next prime is 309272489. The reversal of 309272473 is 374272903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 299013264 + 10259209 = 17292^2 + 3203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309272473 is a prime.

It is not a weakly prime, because it can be changed into another prime (309252473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154636236 + 154636237.

It is an arithmetic number, because the mean of its divisors is an integer number (154636237).

Almost surely, 2^309272473 is an apocalyptic number.

It is an amenable number.

309272473 is a deficient number, since it is larger than the sum of its proper divisors (1).

309272473 is an equidigital number, since it uses as much as digits as its factorization.

309272473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 37.

The square root of 309272473 is about 17586.1443471842. The cubic root of 309272473 is about 676.2600864512.

The spelling of 309272473 in words is "three hundred nine million, two hundred seventy-two thousand, four hundred seventy-three".