1131423431 has 4 divisors (see below), whose sum is σ = 1131493200. Its totient is φ = 1131353664.

The previous prime is 1131423427. The next prime is 1131423437. The reversal of 1131423431 is 1343241311.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1343241311 = 89 ⋅15092599.

It is a cyclic number.

It is not a de Polignac number, because 1131423431 - 2² = 1131423427 is a prime.

It is a super-2 number, since 2×1131423431² = 2560237960431623522, 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 = 1131423397 and 1131423406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131423437) 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, 3575 + ... + 47703.

It is an arithmetic number, because the mean of its divisors is an integer number (282873300).

Almost surely, 2^1131423431 is an apocalyptic number.

1131423431 is a deficient number, since it is larger than the sum of its proper divisors (69769).

1131423431 is an equidigital number, since it uses as much as digits as its factorization.

1131423431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69768.

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

The square root of 1131423431 is about 33636.6382238178. The cubic root of 1131423431 is about 1042.0176042035.

Adding to 1131423431 its reverse (1343241311), we get a palindrome (2474664742).

The spelling of 1131423431 in words is "one billion, one hundred thirty-one million, four hundred twenty-three thousand, four hundred thirty-one".