1301666 has 4 divisors (see below), whose sum is σ = 1952502. Its totient is φ = 650832.

The previous prime is 1301621. The next prime is 1301669. The reversal of 1301666 is 6661031.

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., 1030225 + 271441 = 1015^2 + 521^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1301669) 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, 325415 + ... + 325418.

2^1301666 is an apocalyptic number.

1301666 is a deficient number, since it is larger than the sum of its proper divisors (650836).

1301666 is an equidigital number, since it uses as much as digits as its factorization.

1301666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650835.

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

The square root of 1301666 is about 1140.9057805095. The cubic root of 1301666 is about 109.1858904695.

Adding to 1301666 its reverse (6661031), we get a palindrome (7962697).

The spelling of 1301666 in words is "one million, three hundred one thousand, six hundred sixty-six".