126530563 has 4 divisors (see below), whose sum is σ = 126935128. Its totient is φ = 126126000.

The previous prime is 126530527. The next prime is 126530611. The reversal of 126530563 is 365035621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126530563 - 2²⁵ = 92976131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126530363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201813 + ... + 202438.

It is an arithmetic number, because the mean of its divisors is an integer number (31733782).

Almost surely, 2^126530563 is an apocalyptic number.

126530563 is a deficient number, since it is larger than the sum of its proper divisors (404565).

126530563 is an equidigital number, since it uses as much as digits as its factorization.

126530563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404564.

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

The square root of 126530563 is about 11248.5804882216. The cubic root of 126530563 is about 502.0324775420.

The spelling of 126530563 in words is "one hundred twenty-six million, five hundred thirty thousand, five hundred sixty-three".