1123431431 has 4 divisors (see below), whose sum is σ = 1123504200. Its totient is φ = 1123358664.

The previous prime is 1123431409. The next prime is 1123431433. The reversal of 1123431431 is 1341343211.

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: 1341343211 = 13 ⋅103180247.

It is a cyclic number.

It is not a de Polignac number, because 1123431431 - 2²² = 1119237127 is a prime.

It is a super-2 number, since 2×1123431431² = 2524196360317415522, 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 = 1123431397 and 1123431406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123431433) 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, 3041 + ... + 47498.

It is an arithmetic number, because the mean of its divisors is an integer number (280876050).

Almost surely, 2^1123431431 is an apocalyptic number.

1123431431 is a deficient number, since it is larger than the sum of its proper divisors (72769).

1123431431 is an equidigital number, since it uses as much as digits as its factorization.

1123431431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72768.

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

The square root of 1123431431 is about 33517.6286601543. The cubic root of 1123431431 is about 1039.5583155882.

Adding to 1123431431 its reverse (1341343211), we get a palindrome (2464774642).

The spelling of 1123431431 in words is "one billion, one hundred twenty-three million, four hundred thirty-one thousand, four hundred thirty-one".