1331021331 has 6 divisors (see below), whose sum is σ = 1922586380. Its totient is φ = 887347548.

The previous prime is 1331021303. The next prime is 1331021333. The reversal of 1331021331 is 1331201331.

It is a happy number.

1331021331 is a `hidden beast` number, since 1 + 3 + 310 + 21 + 331 = 666.

It is not a de Polignac number, because 1331021331 - 2⁵ = 1331021299 is a prime.

It is a super-2 number, since 2×1331021331² = 3543235567154023122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331021333) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73945621 + ... + 73945638.

Almost surely, 2^1331021331 is an apocalyptic number.

1331021331 is a deficient number, since it is larger than the sum of its proper divisors (591565049).

1331021331 is a wasteful number, since it uses less digits than its factorization.

1331021331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147891265 (or 147891262 counting only the distinct ones).

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

The square root of 1331021331 is about 36483.1650353968. The cubic root of 1331021331 is about 1100.0058762771.

Adding to 1331021331 its reverse (1331201331), we get a palindrome (2662222662).

The spelling of 1331021331 in words is "one billion, three hundred thirty-one million, twenty-one thousand, three hundred thirty-one".