1331560 has 16 divisors (see below), whose sum is σ = 2996100. Its totient is φ = 532608.

The previous prime is 1331549. The next prime is 1331567. The reversal of 1331560 is 651331.

It can be written as a sum of positive squares in 2 ways, for example, as 1153476 + 178084 = 1074^2 + 422^2 .

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 3 ways as a sum of consecutive naturals, for example, 16605 + ... + 16684.

2^1331560 is an apocalyptic number.

1331560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331560 is an abundant number, since it is smaller than the sum of its proper divisors (1664540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1331560 is a wasteful number, since it uses less digits than its factorization.

1331560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33300 (or 33296 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 1331560 is about 1153.9324070326. The cubic root of 1331560 is about 110.0154248342.

Adding to 1331560 its reverse (651331), we get a palindrome (1982891).

It can be divided in two parts, 1331 and 560, that added together give a triangular number (1891 = T₆₁).

The spelling of 1331560 in words is "one million, three hundred thirty-one thousand, five hundred sixty".