1123131431 has 4 divisors (see below), whose sum is σ = 1124643792. Its totient is φ = 1121619072.

The previous prime is 1123131403. The next prime is 1123131433. The reversal of 1123131431 is 1341313211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123131431 is a prime.

It is a super-2 number, since 2×1123131431² = 2522848422600215522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123131433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755066 + ... + 756551.

It is an arithmetic number, because the mean of its divisors is an integer number (281160948).

Almost surely, 2^1123131431 is an apocalyptic number.

1123131431 is a deficient number, since it is larger than the sum of its proper divisors (1512361).

1123131431 is an equidigital number, since it uses as much as digits as its factorization.

1123131431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512360.

The product of its digits is 216, while the sum is 20.

The square root of 1123131431 is about 33513.1531044156. The cubic root of 1123131431 is about 1039.4657731477.

Adding to 1123131431 its reverse (1341313211), we get a palindrome (2464444642).

The spelling of 1123131431 in words is "one billion, one hundred twenty-three million, one hundred thirty-one thousand, four hundred thirty-one".