125728563 has 4 divisors (see below), whose sum is σ = 167638088. Its totient is φ = 83819040.

The previous prime is 125728541. The next prime is 125728637. The reversal of 125728563 is 365827521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365827521 = 3 ⋅121942507.

It is not a de Polignac number, because 125728563 - 2⁸ = 125728307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125728513) 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 in 3 ways as a sum of consecutive naturals, for example, 20954758 + ... + 20954763.

It is an arithmetic number, because the mean of its divisors is an integer number (41909522).

Almost surely, 2^125728563 is an apocalyptic number.

125728563 is a deficient number, since it is larger than the sum of its proper divisors (41909525).

125728563 is an equidigital number, since it uses as much as digits as its factorization.

125728563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41909524.

The product of its digits is 100800, while the sum is 39.

The square root of 125728563 is about 11212.8748766764. The cubic root of 125728563 is about 500.9695361176.

The spelling of 125728563 in words is "one hundred twenty-five million, seven hundred twenty-eight thousand, five hundred sixty-three".