1311869 has 4 divisors (see below), whose sum is σ = 1412796. Its totient is φ = 1210944.

The previous prime is 1311857. The next prime is 1311899. The reversal of 1311869 is 9681131.

1311869 = 212² + 213² + ... + 237².

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 68644 + 1243225 = 262^2 + 1115^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311869 - 2⁴ = 1311853 is a prime.

It is a super-2 number, since 2×1311869² = 3442000546322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50444 + ... + 50469.

It is an arithmetic number, because the mean of its divisors is an integer number (353199).

2^1311869 is an apocalyptic number.

It is an amenable number.

1311869 is a deficient number, since it is larger than the sum of its proper divisors (100927).

1311869 is a wasteful number, since it uses less digits than its factorization.

1311869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100926.

The product of its digits is 1296, while the sum is 29.

The square root of 1311869 is about 1145.3684996542. The cubic root of 1311869 is about 109.4704298016.

The spelling of 1311869 in words is "one million, three hundred eleven thousand, eight hundred sixty-nine".