243125563 has 2 divisors, whose sum is σ = 243125564. Its totient is φ = 243125562.

The previous prime is 243125471. The next prime is 243125593. The reversal of 243125563 is 365521342.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243125563 is a prime.

It is a super-2 number, since 2×243125563² = 118220078768133938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243125593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121562781 + 121562782.

It is an arithmetic number, because the mean of its divisors is an integer number (121562782).

Almost surely, 2^243125563 is an apocalyptic number.

243125563 is a deficient number, since it is larger than the sum of its proper divisors (1).

243125563 is an equidigital number, since it uses as much as digits as its factorization.

243125563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 31.

The square root of 243125563 is about 15592.4841830928. The cubic root of 243125563 is about 624.1326105337.

The spelling of 243125563 in words is "two hundred forty-three million, one hundred twenty-five thousand, five hundred sixty-three".