1311431302 has 4 divisors (see below), whose sum is σ = 1967146956. Its totient is φ = 655715650.

The previous prime is 1311431263. The next prime is 1311431321. The reversal of 1311431302 is 2031341131.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1311431302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327857824 + ... + 327857827.

It is an arithmetic number, because the mean of its divisors is an integer number (491786739).

Almost surely, 2^1311431302 is an apocalyptic number.

1311431302 is a deficient number, since it is larger than the sum of its proper divisors (655715654).

1311431302 is an equidigital number, since it uses as much as digits as its factorization.

1311431302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655715653.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1311431302 is about 36213.6894281707. The cubic root of 1311431302 is about 1094.5825370832.

Adding to 1311431302 its reverse (2031341131), we get a palindrome (3342772433).

The spelling of 1311431302 in words is "one billion, three hundred eleven million, four hundred thirty-one thousand, three hundred two".