316661 has 2 divisors, whose sum is σ = 316662. Its totient is φ = 316660.

The previous prime is 316649. The next prime is 316663. The reversal of 316661 is 166613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 302500 + 14161 = 550^2 + 119^2 .

It is an emirp because it is prime and its reverse (166613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 316661 - 2¹⁴ = 300277 is a prime.

Together with 316663, it forms a pair of twin primes.

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 316661.

It is not a weakly prime, because it can be changed into another prime (316663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158330 + 158331.

It is an arithmetic number, because the mean of its divisors is an integer number (158331).

2³¹⁶⁶⁶¹ is an apocalyptic number.

It is an amenable number.

316661 is a deficient number, since it is larger than the sum of its proper divisors (1).

316661 is an equidigital number, since it uses as much as digits as its factorization.

316661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 23.

The square root of 316661 is about 562.7263988832. The cubic root of 316661 is about 68.1603051859.

The spelling of 316661 in words is "three hundred sixteen thousand, six hundred sixty-one".