1311669 has 12 divisors (see below), whose sum is σ = 2006316. Its totient is φ = 822912.

The previous prime is 1311643. The next prime is 1311689. The reversal of 1311669 is 9661131.

It can be written as a sum of positive squares in 2 ways, for example, as 731025 + 580644 = 855^2 + 762^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1311669 is a prime.

It is a super-2 number, since 2×1311669² = 3440951131122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311619) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4134 + ... + 4439.

It is an arithmetic number, because the mean of its divisors is an integer number (167193).

2^1311669 is an apocalyptic number.

It is an amenable number.

1311669 is a deficient number, since it is larger than the sum of its proper divisors (694647).

1311669 is a wasteful number, since it uses less digits than its factorization.

1311669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8596 (or 8593 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 1311669 is about 1145.2811881804. The cubic root of 1311669 is about 109.4648664416.

The spelling of 1311669 in words is "one million, three hundred eleven thousand, six hundred sixty-nine".