1331920443 has 8 divisors (see below), whose sum is σ = 2029593088. Its totient is φ = 761097384.

The previous prime is 1331920441. The next prime is 1331920477. The reversal of 1331920443 is 3440291331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1331920443 - 2¹ = 1331920441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331920443.

It is not an unprimeable number, because it can be changed into a prime (1331920441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31712371 + ... + 31712412.

It is an arithmetic number, because the mean of its divisors is an integer number (253699136).

Almost surely, 2^1331920443 is an apocalyptic number.

1331920443 is a deficient number, since it is larger than the sum of its proper divisors (697672645).

1331920443 is an equidigital number, since it uses as much as digits as its factorization.

1331920443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63424793.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 1331920443 is about 36495.4852413281. The cubic root of 1331920443 is about 1100.2535071367.

The spelling of 1331920443 in words is "one billion, three hundred thirty-one million, nine hundred twenty thousand, four hundred forty-three".