1311332131 has 4 divisors (see below), whose sum is σ = 1318126792. Its totient is φ = 1304537472.

The previous prime is 1311332129. The next prime is 1311332137. The reversal of 1311332131 is 1312331131.

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

It is a cyclic number.

It is not a de Polignac number, because 1311332131 - 2¹ = 1311332129 is a prime.

It is a super-2 number, since 2×1311332131² = 3439183915586002322, 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 = 1311332099 and 1311332108.

It is not an unprimeable number, because it can be changed into a prime (1311332137) 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, 3397041 + ... + 3397426.

It is an arithmetic number, because the mean of its divisors is an integer number (329531698).

Almost surely, 2^1311332131 is an apocalyptic number.

1311332131 is a deficient number, since it is larger than the sum of its proper divisors (6794661).

1311332131 is an equidigital number, since it uses as much as digits as its factorization.

1311332131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6794660.

The product of its digits is 162, while the sum is 19.

The square root of 1311332131 is about 36212.3201548865. The cubic root of 1311332131 is about 1094.5549454533.

Adding to 1311332131 its reverse (1312331131), we get a palindrome (2623663262).

The spelling of 1311332131 in words is "one billion, three hundred eleven million, three hundred thirty-two thousand, one hundred thirty-one".