1313666 has 4 divisors (see below), whose sum is σ = 1970502. Its totient is φ = 656832.

The previous prime is 1313657. The next prime is 1313677. The reversal of 1313666 is 6663131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 758641 + 555025 = 871^2 + 745^2 .

It is a congruent number.

It is an unprimeable number.

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, 328415 + ... + 328418.

2^1313666 is an apocalyptic number.

1313666 is a deficient number, since it is larger than the sum of its proper divisors (656836).

1313666 is an equidigital number, since it uses as much as digits as its factorization.

1313666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656835.

The product of its digits is 1944, while the sum is 26.

The square root of 1313666 is about 1146.1526948884. The cubic root of 1313666 is about 109.5203912457.

Adding to 1313666 its reverse (6663131), we get a palindrome (7976797).

The spelling of 1313666 in words is "one million, three hundred thirteen thousand, six hundred sixty-six".