1331263820 has 24 divisors (see below), whose sum is σ = 2810147424. Its totient is φ = 529744896.

The previous prime is 1331263819. The next prime is 1331263831. The reversal of 1331263820 is 283621331.

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 7 ways as a sum of consecutive naturals, for example, 168584 + ... + 176303.

It is an arithmetic number, because the mean of its divisors is an integer number (117089476).

Almost surely, 2^1331263820 is an apocalyptic number.

1331263820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331263820 is an abundant number, since it is smaller than the sum of its proper divisors (1478883604).

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

1331263820 is a wasteful number, since it uses less digits than its factorization.

1331263820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345089 (or 345087 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1331263820 is about 36486.4881839839. The cubic root of 1331263820 is about 1100.0726728846.

The spelling of 1331263820 in words is "one billion, three hundred thirty-one million, two hundred sixty-three thousand, eight hundred twenty".