1311363731 has 36 divisors (see below), whose sum is σ = 1500008328. Its totient is φ = 1142152704.

The previous prime is 1311363709. The next prime is 1311363737. The reversal of 1311363731 is 1373631131.

It is not a de Polignac number, because 1311363731 - 2¹⁰ = 1311362707 is a prime.

It is a super-2 number, since 2×1311363731² = 3439349669964480722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 1311363694 and 1311363703.

It is not an unprimeable number, because it can be changed into a prime (1311363737) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 19572560 + ... + 19572626.

It is an arithmetic number, because the mean of its divisors is an integer number (41666898).

Almost surely, 2^1311363731 is an apocalyptic number.

1311363731 is a deficient number, since it is larger than the sum of its proper divisors (188644597).

1311363731 is an equidigital number, since it uses as much as digits as its factorization.

1311363731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 150 counting only the distinct ones).

The product of its digits is 3402, while the sum is 29.

The square root of 1311363731 is about 36212.7564678526. The cubic root of 1311363731 is about 1094.5637374437.

Adding to 1311363731 its reverse (1373631131), we get a palindrome (2684994862).

The spelling of 1311363731 in words is "one billion, three hundred eleven million, three hundred sixty-three thousand, seven hundred thirty-one".