311617 has 4 divisors (see below), whose sum is σ = 316336. Its totient is φ = 306900.

The previous prime is 311609. The next prime is 311653. The reversal of 311617 is 716113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 716113 = 811 ⋅883.

It is a cyclic number.

It is not a de Polignac number, because 311617 - 2³ = 311609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311594 and 311603.

It is not an unprimeable number, because it can be changed into a prime (311677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2259 + ... + 2392.

It is an arithmetic number, because the mean of its divisors is an integer number (79084).

2³¹¹⁶¹⁷ is an apocalyptic number.

It is an amenable number.

311617 is a deficient number, since it is larger than the sum of its proper divisors (4719).

311617 is an equidigital number, since it uses as much as digits as its factorization.

311617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4718.

The product of its digits is 126, while the sum is 19.

The square root of 311617 is about 558.2266564757. The cubic root of 311617 is about 67.7964646335.

Subtracting 311617 from its reverse (716113), we obtain a square (404496 = 636²).

The spelling of 311617 in words is "three hundred eleven thousand, six hundred seventeen".