309113 has 4 divisors (see below), whose sum is σ = 353280. Its totient is φ = 264948.

The previous prime is 309109. The next prime is 309121. The reversal of 309113 is 311903.

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 309113 - 2² = 309109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 309091 and 309100.

It is not an unprimeable number, because it can be changed into a prime (309173) 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, 22073 + ... + 22086.

It is an arithmetic number, because the mean of its divisors is an integer number (88320).

2³⁰⁹¹¹³ is an apocalyptic number.

It is an amenable number.

309113 is a deficient number, since it is larger than the sum of its proper divisors (44167).

309113 is an equidigital number, since it uses as much as digits as its factorization.

309113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44166.

The product of its (nonzero) digits is 81, while the sum is 17.

The square root of 309113 is about 555.9793161620. The cubic root of 309113 is about 67.6143831071.

The spelling of 309113 in words is "three hundred nine thousand, one hundred thirteen".