309797 has 2 divisors, whose sum is σ = 309798. Its totient is φ = 309796.

The previous prime is 309781. The next prime is 309811. The reversal of 309797 is 797903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160801 + 148996 = 401^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 309797 - 2⁴ = 309781 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 309797.

It is not a weakly prime, because it can be changed into another prime (309707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154898 + 154899.

It is an arithmetic number, because the mean of its divisors is an integer number (154899).

2³⁰⁹⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

309797 is a deficient number, since it is larger than the sum of its proper divisors (1).

309797 is an equidigital number, since it uses as much as digits as its factorization.

309797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11907, while the sum is 35.

The square root of 309797 is about 556.5941070475. The cubic root of 309797 is about 67.6642183535.

The spelling of 309797 in words is "three hundred nine thousand, seven hundred ninety-seven".