309103 has 4 divisors (see below), whose sum is σ = 312208. Its totient is φ = 306000.

The previous prime is 309091. The next prime is 309107. The reversal of 309103 is 301903.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309103 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309107) 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 3 ways as a sum of consecutive naturals, for example, 1398 + ... + 1603.

It is an arithmetic number, because the mean of its divisors is an integer number (78052).

2³⁰⁹¹⁰³ is an apocalyptic number.

309103 is a deficient number, since it is larger than the sum of its proper divisors (3105).

309103 is a wasteful number, since it uses less digits than its factorization.

309103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104.

The product of its (nonzero) digits is 81, while the sum is 16.

The square root of 309103 is about 555.9703229490. The cubic root of 309103 is about 67.6136539767.

The spelling of 309103 in words is "three hundred nine thousand, one hundred three".