1125353561 has 4 divisors (see below), whose sum is σ = 1135870992. Its totient is φ = 1114836132.

The previous prime is 1125353531. The next prime is 1125353569. The reversal of 1125353561 is 1653535211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1125353561 - 2¹⁴ = 1125337177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1125353569) 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, 5258555 + ... + 5258768.

It is an arithmetic number, because the mean of its divisors is an integer number (283967748).

Almost surely, 2^1125353561 is an apocalyptic number.

It is an amenable number.

1125353561 is a deficient number, since it is larger than the sum of its proper divisors (10517431).

1125353561 is a wasteful number, since it uses less digits than its factorization.

1125353561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10517430.

The product of its digits is 13500, while the sum is 32.

The square root of 1125353561 is about 33546.2898246587. The cubic root of 1125353561 is about 1040.1508536721.

Adding to 1125353561 its reverse (1653535211), we get a palindrome (2778888772).

The spelling of 1125353561 in words is "one billion, one hundred twenty-five million, three hundred fifty-three thousand, five hundred sixty-one".