1311240031 has 8 divisors (see below), whose sum is σ = 1321684880. Its totient is φ = 1300836672.

The previous prime is 1311240023. The next prime is 1311240037. The reversal of 1311240031 is 1300421131.

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 1311240031 - 2³ = 1311240023 is a prime.

It is a super-2 number, since 2×1311240031² = 3438700837793761922, 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 = 1311239987 and 1311240014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311240037) 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, 54691 + ... + 74923.

It is an arithmetic number, because the mean of its divisors is an integer number (165210610).

Almost surely, 2^1311240031 is an apocalyptic number.

1311240031 is a deficient number, since it is larger than the sum of its proper divisors (10444849).

1311240031 is a wasteful number, since it uses less digits than its factorization.

1311240031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20745.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1311240031 is about 36211.0484659033. The cubic root of 1311240031 is about 1094.5293198908.

Adding to 1311240031 its reverse (1300421131), we get a palindrome (2611661162).

The spelling of 1311240031 in words is "one billion, three hundred eleven million, two hundred forty thousand, thirty-one".