1331241040 has 20 divisors (see below), whose sum is σ = 3095135604. Its totient is φ = 532496384.

The previous prime is 1331240993. The next prime is 1331241047. The reversal of 1331241040 is 401421331.

It can be written as a sum of positive squares in 2 ways, for example, as 202549824 + 1128691216 = 14232^2 + 33596^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 1331240999 and 1331241017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331241047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8320177 + ... + 8320336.

Almost surely, 2^1331241040 is an apocalyptic number.

1331241040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331241040 is an abundant number, since it is smaller than the sum of its proper divisors (1763894564).

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

1331241040 is a wasteful number, since it uses less digits than its factorization.

1331241040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16640526 (or 16640520 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1331241040 is about 36486.1760122927. The cubic root of 1331241040 is about 1100.0663981958.

Adding to 1331241040 its reverse (401421331), we get a palindrome (1732662371).

The spelling of 1331241040 in words is "one billion, three hundred thirty-one million, two hundred forty-one thousand, forty".