1331020424 has 48 divisors (see below), whose sum is σ = 2601346020. Its totient is φ = 638426880.

The previous prime is 1331020421. The next prime is 1331020489. The reversal of 1331020424 is 4240201331.

It can be written as a sum of positive squares in 6 ways, for example, as 687383524 + 643636900 = 26218^2 + 25370^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1331020396 and 1331020405.

It is not an unprimeable number, because it can be changed into a prime (1331020421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1217222 + ... + 1218314.

Almost surely, 2^1331020424 is an apocalyptic number.

It is an amenable number.

1331020424 is a deficient number, since it is larger than the sum of its proper divisors (1270325596).

1331020424 is a wasteful number, since it uses less digits than its factorization.

1331020424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338 (or 1305 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1331020424 is about 36483.1526050039. The cubic root of 1331020424 is about 1100.0056264175.

Adding to 1331020424 its reverse (4240201331), we get a palindrome (5571221755).

The spelling of 1331020424 in words is "one billion, three hundred thirty-one million, twenty thousand, four hundred twenty-four".