1311245 has 8 divisors (see below), whose sum is σ = 1694616. Its totient is φ = 968256.

The previous prime is 1311241. The next prime is 1311251. The reversal of 1311245 is 5421131.

It can be written as a sum of positive squares in 4 ways, for example, as 299209 + 1012036 = 547^2 + 1006^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311245 - 2² = 1311241 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 (1311241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10022 + ... + 10151.

It is an arithmetic number, because the mean of its divisors is an integer number (211827).

2^1311245 is an apocalyptic number.

It is an amenable number.

1311245 is a deficient number, since it is larger than the sum of its proper divisors (383371).

1311245 is a wasteful number, since it uses less digits than its factorization.

1311245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20191.

The product of its digits is 120, while the sum is 17.

The square root of 1311245 is about 1145.0960658390. The cubic root of 1311245 is about 109.4530702478.

Adding to 1311245 its reverse (5421131), we get a palindrome (6732376).

The spelling of 1311245 in words is "one million, three hundred eleven thousand, two hundred forty-five".