1312661 has 16 divisors (see below), whose sum is σ = 1584000. Its totient is φ = 1086624.

The previous prime is 1312657. The next prime is 1312667. The reversal of 1312661 is 1662131.

It is not a de Polignac number, because 1312661 - 2² = 1312657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14705 + ... + 14793.

It is an arithmetic number, because the mean of its divisors is an integer number (99000).

2^1312661 is an apocalyptic number.

It is an amenable number.

1312661 is a deficient number, since it is larger than the sum of its proper divisors (271339).

1312661 is an frugal number, since it uses more digits than its factorization.

1312661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 139 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

The square root of 1312661 is about 1145.7141877449. The cubic root of 1312661 is about 109.4924551559.

Adding to 1312661 its reverse (1662131), we get a palindrome (2974792).

The spelling of 1312661 in words is "one million, three hundred twelve thousand, six hundred sixty-one".