1311423431 has 4 divisors (see below), whose sum is σ = 1316865264. Its totient is φ = 1305981600.

The previous prime is 1311423409. The next prime is 1311423437. The reversal of 1311423431 is 1343241131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1343241131 = 383 ⋅3507157.

It is a cyclic number.

It is not a de Polignac number, because 1311423431 - 2¹⁸ = 1311161287 is a prime.

It is a super-2 number, since 2×1311423431² = 3439662830751623522, 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 = 1311423397 and 1311423406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311423437) 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, 2720555 + ... + 2721036.

It is an arithmetic number, because the mean of its divisors is an integer number (329216316).

Almost surely, 2^1311423431 is an apocalyptic number.

1311423431 is a deficient number, since it is larger than the sum of its proper divisors (5441833).

1311423431 is an equidigital number, since it uses as much as digits as its factorization.

1311423431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5441832.

The product of its digits is 864, while the sum is 23.

The square root of 1311423431 is about 36213.5807536344. The cubic root of 1311423431 is about 1094.5803472426.

Adding to 1311423431 its reverse (1343241131), we get a palindrome (2654664562).

The spelling of 1311423431 in words is "one billion, three hundred eleven million, four hundred twenty-three thousand, four hundred thirty-one".