1331245 has 8 divisors (see below), whose sum is σ = 1652760. Its totient is φ = 1028160.

The previous prime is 1331243. The next prime is 1331249. The reversal of 1331245 is 5421331.

It can be written as a sum of positive squares in 4 ways, for example, as 209764 + 1121481 = 458^2 + 1059^2 .

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

It is not a de Polignac number, because 1331245 - 2¹ = 1331243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331243) 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, 4446 + ... + 4735.

It is an arithmetic number, because the mean of its divisors is an integer number (206595).

2^1331245 is an apocalyptic number.

It is an amenable number.

1331245 is a deficient number, since it is larger than the sum of its proper divisors (321515).

1331245 is an equidigital number, since it uses as much as digits as its factorization.

1331245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9215.

The product of its digits is 360, while the sum is 19.

The square root of 1331245 is about 1153.7959091624. The cubic root of 1331245 is about 110.0067488972.

Adding to 1331245 its reverse (5421331), we get a palindrome (6752576).

It can be divided in two parts, 133 and 1245, that added together give a triangular number (1378 = T₅₂).

The spelling of 1331245 in words is "one million, three hundred thirty-one thousand, two hundred forty-five".