1311725 has 12 divisors (see below), whose sum is σ = 1651680. Its totient is φ = 1033200.

The previous prime is 1311721. The next prime is 1311733. The reversal of 1311725 is 5271131.

It is not a de Polignac number, because 1311725 - 2² = 1311721 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1311697 and 1311706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311721) 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, 1406 + ... + 2144.

It is an arithmetic number, because the mean of its divisors is an integer number (137640).

2^1311725 is an apocalyptic number.

It is an amenable number.

1311725 is a deficient number, since it is larger than the sum of its proper divisors (339955).

1311725 is an equidigital number, since it uses as much as digits as its factorization.

1311725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820 (or 815 counting only the distinct ones).

The product of its digits is 210, while the sum is 20.

The square root of 1311725 is about 1145.3056360640. The cubic root of 1311725 is about 109.4664242394.

Adding to 1311725 its reverse (5271131), we get a palindrome (6582856).

The spelling of 1311725 in words is "one million, three hundred eleven thousand, seven hundred twenty-five".