1311188431 has 16 divisors (see below), whose sum is σ = 1552416768. Its totient is φ = 1083700800.

The previous prime is 1311188413. The next prime is 1311188443. The reversal of 1311188431 is 1348811131.

It is a happy number.

It is not a de Polignac number, because 1311188431 - 2⁹ = 1311187919 is a prime.

It is a super-2 number, since 2×1311188431² = 3438430203176483522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 1311188393 and 1311188402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311188401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50226 + ... + 71728.

It is an arithmetic number, because the mean of its divisors is an integer number (97026048).

Almost surely, 2^1311188431 is an apocalyptic number.

1311188431 is a deficient number, since it is larger than the sum of its proper divisors (241228337).

1311188431 is a wasteful number, since it uses less digits than its factorization.

1311188431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21822.

The product of its digits is 2304, while the sum is 31.

The square root of 1311188431 is about 36210.3359691677. The cubic root of 1311188431 is about 1094.5149623736.

Adding to 1311188431 its reverse (1348811131), we get a palindrome (2659999562).

The spelling of 1311188431 in words is "one billion, three hundred eleven million, one hundred eighty-eight thousand, four hundred thirty-one".