51240503 has 4 divisors (see below), whose sum is σ = 51290400. Its totient is φ = 51190608.

The previous prime is 51240493. The next prime is 51240547. The reversal of 51240503 is 30504215.

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 51240503 - 2⁶ = 51240439 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 (51240583) 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, 23375 + ... + 25472.

It is an arithmetic number, because the mean of its divisors is an integer number (12822600).

Almost surely, 2^51240503 is an apocalyptic number.

51240503 is a deficient number, since it is larger than the sum of its proper divisors (49897).

51240503 is a wasteful number, since it uses less digits than its factorization.

51240503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49896.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 51240503 is about 7158.2472016549. The cubic root of 51240503 is about 371.4249966478.

Adding to 51240503 its reverse (30504215), we get a palindrome (81744718).

The spelling of 51240503 in words is "fifty-one million, two hundred forty thousand, five hundred three".