1200661603 has 2 divisors, whose sum is σ = 1200661604. Its totient is φ = 1200661602.

The previous prime is 1200661549. The next prime is 1200661621. The reversal of 1200661603 is 3061660021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200661603 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200661633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600330801 + 600330802.

It is an arithmetic number, because the mean of its divisors is an integer number (600330802).

Almost surely, 2^1200661603 is an apocalyptic number.

1200661603 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200661603 is an equidigital number, since it uses as much as digits as its factorization.

1200661603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1200661603 is about 34650.5642522600. The cubic root of 1200661603 is about 1062.8538272187.

The spelling of 1200661603 in words is "one billion, two hundred million, six hundred sixty-one thousand, six hundred three".