1003320391 has 4 divisors (see below), whose sum is σ = 1006010632. Its totient is φ = 1000630152.

The previous prime is 1003320349. The next prime is 1003320397. The reversal of 1003320391 is 1930233001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1003320391 - 2⁹ = 1003319879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1003320397) 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, 1344561 + ... + 1345306.

It is an arithmetic number, because the mean of its divisors is an integer number (251502658).

Almost surely, 2^1003320391 is an apocalyptic number.

1003320391 is a deficient number, since it is larger than the sum of its proper divisors (2690241).

1003320391 is an equidigital number, since it uses as much as digits as its factorization.

1003320391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690240.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 1003320391 is about 31675.2330851724. The cubic root of 1003320391 is about 1001.1055742551.

Adding to 1003320391 its reverse (1930233001), we get a palindrome (2933553392).

The spelling of 1003320391 in words is "one billion, three million, three hundred twenty thousand, three hundred ninety-one".