1125321431 has 4 divisors (see below), whose sum is σ = 1211884632. Its totient is φ = 1038758232.

The previous prime is 1125321403. The next prime is 1125321469. The reversal of 1125321431 is 1341235211.

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

It is a cyclic number.

It is not a de Polignac number, because 1125321431 - 2¹⁰ = 1125320407 is a prime.

It is a super-2 number, since 2×1125321431² = 2532696646135775522, 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 = 1125321397 and 1125321406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125321031) 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, 43281581 + ... + 43281606.

It is an arithmetic number, because the mean of its divisors is an integer number (302971158).

Almost surely, 2^1125321431 is an apocalyptic number.

1125321431 is a deficient number, since it is larger than the sum of its proper divisors (86563201).

1125321431 is an equidigital number, since it uses as much as digits as its factorization.

1125321431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86563200.

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

The square root of 1125321431 is about 33545.8109307258. The cubic root of 1125321431 is about 1040.1409544528.

Adding to 1125321431 its reverse (1341235211), we get a palindrome (2466556642).

The spelling of 1125321431 in words is "one billion, one hundred twenty-five million, three hundred twenty-one thousand, four hundred thirty-one".