1125345561 has 8 divisors (see below), whose sum is σ = 1535355360. Its totient is φ = 732783072.

The previous prime is 1125345553. The next prime is 1125345563. The reversal of 1125345561 is 1655435211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1125345561 - 2³ = 1125345553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1125345563) 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 7 ways as a sum of consecutive naturals, for example, 4361676 + ... + 4361933.

It is an arithmetic number, because the mean of its divisors is an integer number (191919420).

Almost surely, 2^1125345561 is an apocalyptic number.

It is an amenable number.

1125345561 is a deficient number, since it is larger than the sum of its proper divisors (410009799).

1125345561 is an equidigital number, since it uses as much as digits as its factorization.

1125345561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8723655.

The product of its digits is 18000, while the sum is 33.

The square root of 1125345561 is about 33546.1705862234. The cubic root of 1125345561 is about 1040.1483888981.

The spelling of 1125345561 in words is "one billion, one hundred twenty-five million, three hundred forty-five thousand, five hundred sixty-one".