309013 has 2 divisors, whose sum is σ = 309014. Its totient is φ = 309012.

The previous prime is 309011. The next prime is 309019. The reversal of 309013 is 310903.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248004 + 61009 = 498^2 + 247^2 .

It is a cyclic number.

It is not a de Polignac number, because 309013 - 2¹ = 309011 is a prime.

Together with 309011, it forms a pair of twin primes.

It is a nialpdrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154506 + 154507.

It is an arithmetic number, because the mean of its divisors is an integer number (154507).

2³⁰⁹⁰¹³ is an apocalyptic number.

It is an amenable number.

309013 is a deficient number, since it is larger than the sum of its proper divisors (1).

309013 is an equidigital number, since it uses as much as digits as its factorization.

309013 is an evil number, because the sum of its binary digits is even.

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

The square root of 309013 is about 555.8893774844. The cubic root of 309013 is about 67.6070910947.

Adding to 309013 its reverse (310903), we get a palindrome (619916).

The spelling of 309013 in words is "three hundred nine thousand, thirteen".