51545503 has 4 divisors (see below), whose sum is σ = 52271568. Its totient is φ = 50819440.

The previous prime is 51545497. The next prime is 51545531. The reversal of 51545503 is 30554515.

51545503 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51545503 - 2⁵ = 51545471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51545563) 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 in 3 ways as a sum of consecutive naturals, for example, 362926 + ... + 363067.

It is an arithmetic number, because the mean of its divisors is an integer number (13067892).

Almost surely, 2^51545503 is an apocalyptic number.

51545503 is a deficient number, since it is larger than the sum of its proper divisors (726065).

51545503 is an equidigital number, since it uses as much as digits as its factorization.

51545503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726064.

The product of its (nonzero) digits is 7500, while the sum is 28.

The square root of 51545503 is about 7179.5196914557. The cubic root of 51545503 is about 372.1604864057.

The spelling of 51545503 in words is "fifty-one million, five hundred forty-five thousand, five hundred three".