1311825 has 12 divisors (see below), whose sum is σ = 2169008. Its totient is φ = 699600.

The previous prime is 1311799. The next prime is 1311829. The reversal of 1311825 is 5281131.

It is not a de Polignac number, because 1311825 - 2¹⁰ = 1310801 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon 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 11 ways as a sum of consecutive naturals, for example, 8671 + ... + 8820.

2^1311825 is an apocalyptic number.

1311825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1311825 is a deficient number, since it is larger than the sum of its proper divisors (857183).

1311825 is a wasteful number, since it uses less digits than its factorization.

1311825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17504 (or 17499 counting only the distinct ones).

The product of its digits is 240, while the sum is 21.

The square root of 1311825 is about 1145.3492917010. The cubic root of 1311825 is about 109.4692059109.

Adding to 1311825 its reverse (5281131), we get a palindrome (6592956).

The spelling of 1311825 in words is "one million, three hundred eleven thousand, eight hundred twenty-five".