1311423631 has 8 divisors (see below), whose sum is σ = 1507144320. Its totient is φ = 1117796568.

The previous prime is 1311423601. The next prime is 1311423661. The reversal of 1311423631 is 1363241131.

It is an interprime number because it is at equal distance from previous prime (1311423601) and next prime (1311423661).

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

It is not a de Polignac number, because 1311423631 - 2⁵ = 1311423599 is a prime.

It is a super-2 number, since 2×1311423631² = 3439663879890448322, 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 = 1311423596 and 1311423605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311423601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 522061 + ... + 524566.

It is an arithmetic number, because the mean of its divisors is an integer number (188393040).

Almost surely, 2^1311423631 is an apocalyptic number.

1311423631 is a deficient number, since it is larger than the sum of its proper divisors (195720689).

1311423631 is a wasteful number, since it uses less digits than its factorization.

1311423631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046813.

The product of its digits is 1296, while the sum is 25.

The square root of 1311423631 is about 36213.5835150293. The cubic root of 1311423631 is about 1094.5804028860.

Adding to 1311423631 its reverse (1363241131), we get a palindrome (2674664762).

The spelling of 1311423631 in words is "one billion, three hundred eleven million, four hundred twenty-three thousand, six hundred thirty-one".