1311146831 has 4 divisors (see below), whose sum is σ = 1343126064. Its totient is φ = 1279167600.

The previous prime is 1311146801. The next prime is 1311146833. The reversal of 1311146831 is 1386411131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1386411131 = 7 ⋅198058733.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311146831 is a prime.

It is a super-2 number, since 2×1311146831² = 3438212024882685122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311146794 and 1311146803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311146833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15989555 + ... + 15989636.

It is an arithmetic number, because the mean of its divisors is an integer number (335781516).

Almost surely, 2^1311146831 is an apocalyptic number.

1311146831 is a deficient number, since it is larger than the sum of its proper divisors (31979233).

1311146831 is an equidigital number, since it uses as much as digits as its factorization.

1311146831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31979232.

The product of its digits is 1728, while the sum is 29.

The square root of 1311146831 is about 36209.7615429873. The cubic root of 1311146831 is about 1094.5033870468.

Adding to 1311146831 its reverse (1386411131), we get a palindrome (2697557962).

The spelling of 1311146831 in words is "one billion, three hundred eleven million, one hundred forty-six thousand, eight hundred thirty-one".