1311425231 has 4 divisors (see below), whose sum is σ = 1312963512. Its totient is φ = 1309886952.

The previous prime is 1311425189. The next prime is 1311425233. The reversal of 1311425231 is 1325241131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1325241131 = 3733 ⋅355007.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311425231 is a prime.

It is a super-2 number, since 2×1311425231² = 3439672273006806722, 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 = 1311425197 and 1311425206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311425233) 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, 767861 + ... + 769566.

It is an arithmetic number, because the mean of its divisors is an integer number (328240878).

Almost surely, 2^1311425231 is an apocalyptic number.

1311425231 is a deficient number, since it is larger than the sum of its proper divisors (1538281).

1311425231 is an equidigital number, since it uses as much as digits as its factorization.

1311425231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538280.

The product of its digits is 720, while the sum is 23.

The square root of 1311425231 is about 36213.6056061807. The cubic root of 1311425231 is about 1094.5808480327.

Adding to 1311425231 its reverse (1325241131), we get a palindrome (2636666362).

The spelling of 1311425231 in words is "one billion, three hundred eleven million, four hundred twenty-five thousand, two hundred thirty-one".