309409013 has 4 divisors (see below), whose sum is σ = 312413088. Its totient is φ = 306404940.

The previous prime is 309409003. The next prime is 309409049. The reversal of 309409013 is 310904903.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 309409013 - 2¹² = 309404917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309409003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1501883 + ... + 1502088.

It is an arithmetic number, because the mean of its divisors is an integer number (78103272).

Almost surely, 2^309409013 is an apocalyptic number.

It is an amenable number.

309409013 is a deficient number, since it is larger than the sum of its proper divisors (3004075).

309409013 is a wasteful number, since it uses less digits than its factorization.

309409013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004074.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 309409013 is about 17590.0259522264. The cubic root of 309409013 is about 676.3595919845.

The spelling of 309409013 in words is "three hundred nine million, four hundred nine thousand, thirteen".