313666 has 4 divisors (see below), whose sum is σ = 470502. Its totient is φ = 156832.

The previous prime is 313661. The next prime is 313669. The reversal of 313666 is 666313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666313 = 269 ⋅2477.

It can be written as a sum of positive squares in only one way, i.e., 297025 + 16641 = 545^2 + 129^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 313666.

It is not an unprimeable number, because it can be changed into a prime (313661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78415 + ... + 78418.

2³¹³⁶⁶⁶ is an apocalyptic number.

313666 is a deficient number, since it is larger than the sum of its proper divisors (156836).

313666 is a wasteful number, since it uses less digits than its factorization.

313666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156835.

The product of its digits is 1944, while the sum is 25.

The square root of 313666 is about 560.0589254712. The cubic root of 313666 is about 67.9447359522.

Adding to 313666 its reverse (666313), we get a palindrome (979979).

It can be divided in two parts, 313 and 666, that added together give a palindrome (979).

The spelling of 313666 in words is "three hundred thirteen thousand, six hundred sixty-six".