1125343421 has 4 divisors (see below), whose sum is σ = 1125560700. Its totient is φ = 1125126144.

The previous prime is 1125343319. The next prime is 1125343423. The reversal of 1125343421 is 1243435211.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22372900 + 1102970521 = 4730^2 + 33211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1125343421 - 2¹⁰ = 1125342397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125343423) 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, 100676 + ... + 111293.

It is an arithmetic number, because the mean of its divisors is an integer number (281390175).

Almost surely, 2^1125343421 is an apocalyptic number.

It is an amenable number.

1125343421 is a deficient number, since it is larger than the sum of its proper divisors (217279).

1125343421 is an equidigital number, since it uses as much as digits as its factorization.

1125343421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217278.

The product of its digits is 2880, while the sum is 26.

The square root of 1125343421 is about 33546.1386898701. The cubic root of 1125343421 is about 1040.1477295691.

Adding to 1125343421 its reverse (1243435211), we get a palindrome (2368778632).

The spelling of 1125343421 in words is "one billion, one hundred twenty-five million, three hundred forty-three thousand, four hundred twenty-one".