1331565 has 8 divisors (see below), whose sum is σ = 2130528. Its totient is φ = 710160.

The previous prime is 1331549. The next prime is 1331567. The reversal of 1331565 is 5651331.

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

It is not a de Polignac number, because 1331565 - 2⁴ = 1331549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331567) 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, 44371 + ... + 44400.

It is an arithmetic number, because the mean of its divisors is an integer number (266316).

2^1331565 is an apocalyptic number.

1331565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1331565 is a deficient number, since it is larger than the sum of its proper divisors (798963).

1331565 is an equidigital number, since it uses as much as digits as its factorization.

1331565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88779.

The product of its digits is 1350, while the sum is 24.

The square root of 1331565 is about 1153.9345735353. The cubic root of 1331565 is about 110.0155625364.

Adding to 1331565 its reverse (5651331), we get a palindrome (6982896).

The spelling of 1331565 in words is "one million, three hundred thirty-one thousand, five hundred sixty-five".