1205640203 has 2 divisors, whose sum is σ = 1205640204. Its totient is φ = 1205640202.

The previous prime is 1205640181. The next prime is 1205640211. The reversal of 1205640203 is 3020465021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1205640203 - 2³⁰ = 131898379 is a prime.

It is not a weakly prime, because it can be changed into another prime (1205640223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602820101 + 602820102.

It is an arithmetic number, because the mean of its divisors is an integer number (602820102).

Almost surely, 2^1205640203 is an apocalyptic number.

1205640203 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205640203 is an equidigital number, since it uses as much as digits as its factorization.

1205640203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1205640203 is about 34722.3300341437. The cubic root of 1205640203 is about 1064.3208592288.

The spelling of 1205640203 in words is "one billion, two hundred five million, six hundred forty thousand, two hundred three".