1211745603 has 4 divisors (see below), whose sum is σ = 1615660808. Its totient is φ = 807830400.

The previous prime is 1211745559. The next prime is 1211745607. The reversal of 1211745603 is 3065471121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1211745603 - 2¹⁸ = 1211483459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211745607) 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 in 3 ways as a sum of consecutive naturals, for example, 201957598 + ... + 201957603.

It is an arithmetic number, because the mean of its divisors is an integer number (403915202).

Almost surely, 2^1211745603 is an apocalyptic number.

1211745603 is a deficient number, since it is larger than the sum of its proper divisors (403915205).

1211745603 is an equidigital number, since it uses as much as digits as its factorization.

1211745603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403915204.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 1211745603 is about 34810.1364978651. The cubic root of 1211745603 is about 1066.1144198739.

The spelling of 1211745603 in words is "one billion, two hundred eleven million, seven hundred forty-five thousand, six hundred three".