309713 has 2 divisors, whose sum is σ = 309714. Its totient is φ = 309712.

The previous prime is 309707. The next prime is 309731. The reversal of 309713 is 317903.

Together with next prime (309731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 300304 + 9409 = 548^2 + 97^2 .

It is an emirp because it is prime and its reverse (317903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 309713 - 2⁸ = 309457 is a prime.

It is not a weakly prime, because it can be changed into another prime (309013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154856 + 154857.

It is an arithmetic number, because the mean of its divisors is an integer number (154857).

2³⁰⁹⁷¹³ is an apocalyptic number.

It is an amenable number.

309713 is a deficient number, since it is larger than the sum of its proper divisors (1).

309713 is an equidigital number, since it uses as much as digits as its factorization.

309713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 23.

The square root of 309713 is about 556.5186429941. The cubic root of 309713 is about 67.6581021891.

The spelling of 309713 in words is "three hundred nine thousand, seven hundred thirteen".