1331287540 has 24 divisors (see below), whose sum is σ = 3049859232. Its totient is φ = 484104480.

The previous prime is 1331287501. The next prime is 1331287567. The reversal of 1331287540 is 457821331.

It is a junction number, because it is equal to n+sod(n) for n = 1331287496 and 1331287505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3025434 + ... + 3025873.

It is an arithmetic number, because the mean of its divisors is an integer number (127077468).

Almost surely, 2^1331287540 is an apocalyptic number.

1331287540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331287540 is an abundant number, since it is smaller than the sum of its proper divisors (1718571692).

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

1331287540 is a wasteful number, since it uses less digits than its factorization.

1331287540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6051327 (or 6051325 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1331287540 is about 36486.8132343728. The cubic root of 1331287540 is about 1100.0792064178.

The spelling of 1331287540 in words is "one billion, three hundred thirty-one million, two hundred eighty-seven thousand, five hundred forty".