1125000001 has 2 divisors, whose sum is σ = 1125000002. Its totient is φ = 1125000000.

The previous prime is 1124999999. The next prime is 1125000017. The reversal of 1125000001 is 1000005211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1067982400 + 57017601 = 32680^2 + 7551^2 .

It is a cyclic number.

It is not a de Polignac number, because 1125000001 - 2¹ = 1124999999 is a prime.

Together with 1124999999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1125000301) 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, 562500000 + 562500001.

It is an arithmetic number, because the mean of its divisors is an integer number (562500001).

Almost surely, 2^1125000001 is an apocalyptic number.

It is an amenable number.

1125000001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1125000001 is an equidigital number, since it uses as much as digits as its factorization.

1125000001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 1125000001 is about 33541.0196774040. The cubic root of 1125000001 is about 1040.0419118341.

Adding to 1125000001 its reverse (1000005211), we get a palindrome (2125005212).

The spelling of 1125000001 in words is "one billion, one hundred twenty-five million, one", and thus it is an aban number.