1311323131 has 8 divisors (see below), whose sum is σ = 1389628800. Its totient is φ = 1235223360.

The previous prime is 1311323113. The next prime is 1311323137. The reversal of 1311323131 is 1313231131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311323131 - 2⁷ = 1311323003 is a prime.

It is a super-2 number, since 2×1311323131² = 3439136707791286322, 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 = 1311323099 and 1311323108.

It is not an unprimeable number, because it can be changed into a prime (1311323137) 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, 550251 + ... + 552628.

It is an arithmetic number, because the mean of its divisors is an integer number (173703600).

Almost surely, 2^1311323131 is an apocalyptic number.

1311323131 is a deficient number, since it is larger than the sum of its proper divisors (78305669).

1311323131 is a wasteful number, since it uses less digits than its factorization.

1311323131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102949.

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

The square root of 1311323131 is about 36212.1958875736. The cubic root of 1311323131 is about 1094.5524413796.

Adding to 1311323131 its reverse (1313231131), we get a palindrome (2624554262).

The spelling of 1311323131 in words is "one billion, three hundred eleven million, three hundred twenty-three thousand, one hundred thirty-one".