1331745 has 16 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 694784.

The previous prime is 1331719. The next prime is 1331749. The reversal of 1331745 is 5471331.

It is a cyclic number.

It is not a de Polignac number, because 1331745 - 2⁸ = 1331489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1331749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240 + ... + 1649.

It is an arithmetic number, because the mean of its divisors is an integer number (136080).

2^1331745 is an apocalyptic number.

1331745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1331745 is a deficient number, since it is larger than the sum of its proper divisors (845535).

1331745 is a wasteful number, since it uses less digits than its factorization.

1331745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944.

The product of its digits is 1260, while the sum is 24.

The square root of 1331745 is about 1154.0125649229. The cubic root of 1331745 is about 110.0205195880.

The spelling of 1331745 in words is "one million, three hundred thirty-one thousand, seven hundred forty-five".