5231309 has 2 divisors, whose sum is σ = 5231310. Its totient is φ = 5231308.

The previous prime is 5231297. The next prime is 5231311. The reversal of 5231309 is 9031325.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5189284 + 42025 = 2278^2 + 205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5231309 is a prime.

Together with 5231311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5231329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2615654 + 2615655.

It is an arithmetic number, because the mean of its divisors is an integer number (2615655).

Almost surely, 2^5231309 is an apocalyptic number.

It is an amenable number.

5231309 is a deficient number, since it is larger than the sum of its proper divisors (1).

5231309 is an equidigital number, since it uses as much as digits as its factorization.

5231309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 5231309 is about 2287.2055001683. The cubic root of 5231309 is about 173.5948317071.

The spelling of 5231309 in words is "five million, two hundred thirty-one thousand, three hundred nine".