311609 has 2 divisors, whose sum is σ = 311610. Its totient is φ = 311608.

The previous prime is 311603. The next prime is 311653. The reversal of 311609 is 906113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270400 + 41209 = 520^2 + 203^2 .

It is a cyclic number.

It is not a de Polignac number, because 311609 - 2¹⁶ = 246073 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (311603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155804 + 155805.

It is an arithmetic number, because the mean of its divisors is an integer number (155805).

2³¹¹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

311609 is a deficient number, since it is larger than the sum of its proper divisors (1).

311609 is an equidigital number, since it uses as much as digits as its factorization.

311609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 311609 is about 558.2194908815. The cubic root of 311609 is about 67.7958844594.

The spelling of 311609 in words is "three hundred eleven thousand, six hundred nine".