1031323399 has 4 divisors (see below), whose sum is σ = 1031402536. Its totient is φ = 1031244264.

The previous prime is 1031323393. The next prime is 1031323421. The reversal of 1031323399 is 9933231301.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9933231301 = 7 ⋅1419033043.

It is a cyclic number.

It is not a de Polignac number, because 1031323399 - 2¹¹ = 1031321351 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 (1031323393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14889 + ... + 47794.

It is an arithmetic number, because the mean of its divisors is an integer number (257850634).

Almost surely, 2^1031323399 is an apocalyptic number.

1031323399 is a deficient number, since it is larger than the sum of its proper divisors (79137).

1031323399 is an equidigital number, since it uses as much as digits as its factorization.

1031323399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79136.

The product of its (nonzero) digits is 13122, while the sum is 34.

The square root of 1031323399 is about 32114.2242472086. The cubic root of 1031323399 is about 1010.3339741203. Note that the first 3 decimals are identical.

The spelling of 1031323399 in words is "one billion, thirty-one million, three hundred twenty-three thousand, three hundred ninety-nine".