1331231020 has 48 divisors (see below), whose sum is σ = 3260174400. Its totient is φ = 456419712.

The previous prime is 1331230987. The next prime is 1331231059. The reversal of 1331231020 is 201321331.

It is a super-2 number, since 2×1331231020² = 3544352057220480800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1331230985 and 1331231003.

It is an unprimeable number.

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, 90169 + ... + 103888.

It is an arithmetic number, because the mean of its divisors is an integer number (67920300).

Almost surely, 2^1331231020 is an apocalyptic number.

1331231020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331231020 is an abundant number, since it is smaller than the sum of its proper divisors (1928943380).

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

1331231020 is a wasteful number, since it uses less digits than its factorization.

1331231020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194087 (or 194071 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1331231020 is about 36486.0386997547. The cubic root of 1331231020 is about 1100.0636381916.

Adding to 1331231020 its reverse (201321331), we get a palindrome (1532552351).

The spelling of 1331231020 in words is "one billion, three hundred thirty-one million, two hundred thirty-one thousand, twenty".