309272913 has 24 divisors (see below), whose sum is σ = 454446720. Its totient is φ = 202644000.

The previous prime is 309272903. The next prime is 309272917. The reversal of 309272913 is 319272903.

It is not a de Polignac number, because 309272913 - 2⁹ = 309272401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (309272917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177595 + ... + 179327.

It is an arithmetic number, because the mean of its divisors is an integer number (18935280).

Almost surely, 2^309272913 is an apocalyptic number.

It is an amenable number.

309272913 is a deficient number, since it is larger than the sum of its proper divisors (145173807).

309272913 is a wasteful number, since it uses less digits than its factorization.

309272913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2069 (or 2066 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 309272913 is about 17586.1568570282. The cubic root of 309272913 is about 676.2604071547.

The spelling of 309272913 in words is "three hundred nine million, two hundred seventy-two thousand, nine hundred thirteen".