126503563 has 2 divisors, whose sum is σ = 126503564. Its totient is φ = 126503562.

The previous prime is 126503561. The next prime is 126503599. The reversal of 126503563 is 365305621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126503563 - 2¹ = 126503561 is a prime.

Together with 126503561, it forms a pair of twin primes.

It is equal to p_7190851 and since 126503563 and 7190851 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (126503561) 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, 63251781 + 63251782.

It is an arithmetic number, because the mean of its divisors is an integer number (63251782).

Almost surely, 2^126503563 is an apocalyptic number.

126503563 is a deficient number, since it is larger than the sum of its proper divisors (1).

126503563 is an equidigital number, since it uses as much as digits as its factorization.

126503563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 126503563 is about 11247.3802727569. The cubic root of 126503563 is about 501.9967659035.

The spelling of 126503563 in words is "one hundred twenty-six million, five hundred three thousand, five hundred sixty-three".