1331445 has 16 divisors (see below), whose sum is σ = 2188800. Its totient is φ = 690624.

The previous prime is 1331443. The next prime is 1331471. The reversal of 1331445 is 5441331.

It is not a de Polignac number, because 1331445 - 2¹ = 1331443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 645 + ... + 1754.

It is an arithmetic number, because the mean of its divisors is an integer number (136800).

2^1331445 is an apocalyptic number.

1331445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1331445 is a deficient number, since it is larger than the sum of its proper divisors (857355).

1331445 is a wasteful number, since it uses less digits than its factorization.

1331445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2444.

The product of its digits is 720, while the sum is 21.

The square root of 1331445 is about 1153.8825763482. The cubic root of 1331445 is about 110.0122575872.

Adding to 1331445 its reverse (5441331), we get a palindrome (6772776).

It can be divided in two parts, 1331 and 445, that multiplied together give a palindrome (592295).

The spelling of 1331445 in words is "one million, three hundred thirty-one thousand, four hundred forty-five".