1125170561 has 2 divisors, whose sum is σ = 1125170562. Its totient is φ = 1125170560.

The previous prime is 1125170491. The next prime is 1125170567. The reversal of 1125170561 is 1650715211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1096868161 + 28302400 = 33119^2 + 5320^2 .

It is a cyclic number.

It is not a de Polignac number, because 1125170561 - 2¹⁰ = 1125169537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1125170567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 562585280 + 562585281.

It is an arithmetic number, because the mean of its divisors is an integer number (562585281).

Almost surely, 2^1125170561 is an apocalyptic number.

It is an amenable number.

1125170561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1125170561 is an equidigital number, since it uses as much as digits as its factorization.

1125170561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 29.

The square root of 1125170561 is about 33543.5621394031. The cubic root of 1125170561 is about 1040.0944690443.

Adding to 1125170561 its reverse (1650715211), we get a palindrome (2775885772).

The spelling of 1125170561 in words is "one billion, one hundred twenty-five million, one hundred seventy thousand, five hundred sixty-one".