126405563 has 2 divisors, whose sum is σ = 126405564. Its totient is φ = 126405562.

The previous prime is 126405551. The next prime is 126405571. The reversal of 126405563 is 365504621.

It is a strong prime.

It is an emirp because it is prime and its reverse (365504621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126405563 - 2⁴ = 126405547 is a prime.

It is not a weakly prime, because it can be changed into another prime (126405533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63202781 + 63202782.

It is an arithmetic number, because the mean of its divisors is an integer number (63202782).

Almost surely, 2^126405563 is an apocalyptic number.

126405563 is a deficient number, since it is larger than the sum of its proper divisors (1).

126405563 is an equidigital number, since it uses as much as digits as its factorization.

126405563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 126405563 is about 11243.0228586444. The cubic root of 126405563 is about 501.8671031730.

The spelling of 126405563 in words is "one hundred twenty-six million, four hundred five thousand, five hundred sixty-three".