1331130321 has 16 divisors (see below), whose sum is σ = 1992379200. Its totient is φ = 878269824.

The previous prime is 1331130319. The next prime is 1331130343. The reversal of 1331130321 is 1230311331.

It is a happy number.

1331130321 is a `hidden beast` number, since 1 + 3 + 311 + 30 + 321 = 666.

It is not a de Polignac number, because 1331130321 - 2¹ = 1331130319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1331130294 and 1331130303.

It is not an unprimeable number, because it can be changed into a prime (1331130301) 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, 251511 + ... + 256748.

It is an arithmetic number, because the mean of its divisors is an integer number (124523700).

Almost surely, 2^1331130321 is an apocalyptic number.

It is an amenable number.

1331130321 is a deficient number, since it is larger than the sum of its proper divisors (661248879).

1331130321 is an equidigital number, since it uses as much as digits as its factorization.

1331130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508365 (or 508359 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 1331130321 is about 36484.6587074622. The cubic root of 1331130321 is about 1100.0358999303.

Adding to 1331130321 its reverse (1230311331), we get a palindrome (2561441652).

The spelling of 1331130321 in words is "one billion, three hundred thirty-one million, one hundred thirty thousand, three hundred twenty-one".