1321431303 has 8 divisors (see below), whose sum is σ = 1762419328. Its totient is φ = 880698744.

The previous prime is 1321431299. The next prime is 1321431329. The reversal of 1321431303 is 3031341231.

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

It is not a de Polignac number, because 1321431303 - 2² = 1321431299 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 1321431303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321431343) 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, 51451 + ... + 72732.

It is an arithmetic number, because the mean of its divisors is an integer number (220302416).

Almost surely, 2^1321431303 is an apocalyptic number.

1321431303 is a deficient number, since it is larger than the sum of its proper divisors (440988025).

1321431303 is a wasteful number, since it uses less digits than its factorization.

1321431303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127733.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 1321431303 is about 36351.4965716681. The cubic root of 1321431303 is about 1097.3576531291.

Adding to 1321431303 its reverse (3031341231), we get a palindrome (4352772534).

The spelling of 1321431303 in words is "one billion, three hundred twenty-one million, four hundred thirty-one thousand, three hundred three".