1330991321 has 4 divisors (see below), whose sum is σ = 1451990544. Its totient is φ = 1209992100.

The previous prime is 1330991317. The next prime is 1330991377. The reversal of 1330991321 is 1231990331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1330991321 - 2² = 1330991317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1330991621) 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, 60499595 + ... + 60499616.

It is an arithmetic number, because the mean of its divisors is an integer number (362997636).

Almost surely, 2^1330991321 is an apocalyptic number.

1330991321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1330991321 is a deficient number, since it is larger than the sum of its proper divisors (120999223).

1330991321 is a wasteful number, since it uses less digits than its factorization.

1330991321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120999222.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 1330991321 is about 36482.7537474901. The cubic root of 1330991321 is about 1099.9976090857.

The spelling of 1330991321 in words is "one billion, three hundred thirty million, nine hundred ninety-one thousand, three hundred twenty-one".