1125420561 has 10 divisors (see below), whose sum is σ = 1681183922. Its totient is φ = 750280320.

The previous prime is 1125420529. The next prime is 1125420563. The reversal of 1125420561 is 1650245211.

1125420561 is a `hidden beast` number, since 112 + 542 + 0 + 5 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 733380561 + 392040000 = 27081^2 + 19800^2 .

It is not a de Polignac number, because 1125420561 - 2⁵ = 1125420529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1125420563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6946960 + ... + 6947121.

Almost surely, 2^1125420561 is an apocalyptic number.

It is an amenable number.

1125420561 is a deficient number, since it is larger than the sum of its proper divisors (555763361).

1125420561 is an equidigital number, since it uses as much as digits as its factorization.

1125420561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13894093 (or 13894084 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1125420561 is about 33547.2884299164. The cubic root of 1125420561 is about 1040.1714956957.

Adding to 1125420561 its reverse (1650245211), we get a palindrome (2775665772).

The spelling of 1125420561 in words is "one billion, one hundred twenty-five million, four hundred twenty thousand, five hundred sixty-one".