1125161251 has 2 divisors, whose sum is σ = 1125161252. Its totient is φ = 1125161250.

The previous prime is 1125161239. The next prime is 1125161281. The reversal of 1125161251 is 1521615211.

It is a weak prime.

It is an emirp because it is prime and its reverse (1521615211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1125161251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1125161281) 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 as a sum of consecutive naturals, namely, 562580625 + 562580626.

It is an arithmetic number, because the mean of its divisors is an integer number (562580626).

Almost surely, 2^1125161251 is an apocalyptic number.

1125161251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1125161251 is an equidigital number, since it uses as much as digits as its factorization.

1125161251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 600, while the sum is 25.

The square root of 1125161251 is about 33543.4233643497. The cubic root of 1125161251 is about 1040.0916003515.

Adding to 1125161251 its reverse (1521615211), we get a palindrome (2646776462).

The spelling of 1125161251 in words is "one billion, one hundred twenty-five million, one hundred sixty-one thousand, two hundred fifty-one".