1225000001 has 2 divisors, whose sum is σ = 1225000002. Its totient is φ = 1225000000.

The previous prime is 1224999973. The next prime is 1225000003. The reversal of 1225000001 is 1000005221.

It is a Cunningham number, because it is equal to 35000²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1225000000 + 1 = 35000^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225000001 - 2¹⁰ = 1224998977 is a prime.

Together with 1225000003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1225000003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612500000 + 612500001.

It is an arithmetic number, because the mean of its divisors is an integer number (612500001).

Almost surely, 2^1225000001 is an apocalyptic number.

It is an amenable number.

1225000001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225000001 is an equidigital number, since it uses as much as digits as its factorization.

1225000001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 1225000001 is about 35000.0000142857. Note that the first 4 decimals coincide. The cubic root of 1225000001 is about 1069.9874808562.

Adding to 1225000001 its reverse (1000005221), we get a palindrome (2225005222).

The spelling of 1225000001 in words is "one billion, two hundred twenty-five million, one", and thus it is an aban number.