1603645243 has 2 divisors, whose sum is σ = 1603645244. Its totient is φ = 1603645242.

The previous prime is 1603645223. The next prime is 1603645249. The reversal of 1603645243 is 3425463061.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1603645243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1603645199 and 1603645208.

It is not a weakly prime, because it can be changed into another prime (1603645249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 801822621 + 801822622.

It is an arithmetic number, because the mean of its divisors is an integer number (801822622).

Almost surely, 2^1603645243 is an apocalyptic number.

1603645243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1603645243 is an equidigital number, since it uses as much as digits as its factorization.

1603645243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 1603645243 is about 40045.5396142941. The cubic root of 1603645243 is about 1170.4946511927.

The spelling of 1603645243 in words is "one billion, six hundred three million, six hundred forty-five thousand, two hundred forty-three".