317621 has 2 divisors, whose sum is σ = 317622. Its totient is φ = 317620.

The previous prime is 317617. The next prime is 317651. The reversal of 317621 is 126713.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220900 + 96721 = 470^2 + 311^2 .

It is an emirp because it is prime and its reverse (126713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 317621 - 2² = 317617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 317593 and 317602.

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 317621.

It is not a weakly prime, because it can be changed into another prime (317651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158810 + 158811.

It is an arithmetic number, because the mean of its divisors is an integer number (158811).

2³¹⁷⁶²¹ is an apocalyptic number.

It is an amenable number.

317621 is a deficient number, since it is larger than the sum of its proper divisors (1).

317621 is an equidigital number, since it uses as much as digits as its factorization.

317621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252, while the sum is 20.

The square root of 317621 is about 563.5787433891. The cubic root of 317621 is about 68.2291147123.

The spelling of 317621 in words is "three hundred seventeen thousand, six hundred twenty-one".