1331125521 has 16 divisors (see below), whose sum is σ = 1938947520. Its totient is φ = 805590720.

The previous prime is 1331125519. The next prime is 1331125583. The reversal of 1331125521 is 1255211331.

It is not a de Polignac number, because 1331125521 - 2¹ = 1331125519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1331125491 and 1331125500.

It is not an unprimeable number, because it can be changed into a prime (1331125511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5050 + ... + 51843.

It is an arithmetic number, because the mean of its divisors is an integer number (121184220).

Almost surely, 2^1331125521 is an apocalyptic number.

1331125521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1331125521 is a deficient number, since it is larger than the sum of its proper divisors (607821999).

1331125521 is a wasteful number, since it uses less digits than its factorization.

1331125521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57616.

The product of its digits is 900, while the sum is 24.

The square root of 1331125521 is about 36484.5929263299. The cubic root of 1331125521 is about 1100.0345777009.

Adding to 1331125521 its reverse (1255211331), we get a palindrome (2586336852).

The spelling of 1331125521 in words is "one billion, three hundred thirty-one million, one hundred twenty-five thousand, five hundred twenty-one".