1311431432 has 32 divisors (see below), whose sum is σ = 2487888000. Its totient is φ = 648021504.

The previous prime is 1311431431. The next prime is 1311431489. The reversal of 1311431432 is 2341341131.

It is a junction number, because it is equal to n+sod(n) for n = 1311431398 and 1311431407.

It is not an unprimeable number, because it can be changed into a prime (1311431431) 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, 492248 + ... + 494904.

It is an arithmetic number, because the mean of its divisors is an integer number (77746500).

Almost surely, 2^1311431432 is an apocalyptic number.

It is an amenable number.

1311431432 is a deficient number, since it is larger than the sum of its proper divisors (1176456568).

1311431432 is a wasteful number, since it uses less digits than its factorization.

1311431432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3365 (or 3361 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 1311431432 is about 36213.6912230720. The cubic root of 1311431432 is about 1094.5825732512.

Adding to 1311431432 its reverse (2341341131), we get a palindrome (3652772563).

The spelling of 1311431432 in words is "one billion, three hundred eleven million, four hundred thirty-one thousand, four hundred thirty-two".