51231503 has 4 divisors (see below), whose sum is σ = 51261960. Its totient is φ = 51201048.

The previous prime is 51231491. The next prime is 51231547. The reversal of 51231503 is 30513215.

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 51231503 - 2⁸ = 51231247 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 (51231553) 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, 12548 + ... + 16121.

It is an arithmetic number, because the mean of its divisors is an integer number (12815490).

Almost surely, 2^51231503 is an apocalyptic number.

51231503 is a deficient number, since it is larger than the sum of its proper divisors (30457).

51231503 is a wasteful number, since it uses less digits than its factorization.

51231503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30456.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 51231503 is about 7157.6185285331. The cubic root of 51231503 is about 371.4032493938.

Adding to 51231503 its reverse (30513215), we get a palindrome (81744718).

The spelling of 51231503 in words is "fifty-one million, two hundred thirty-one thousand, five hundred three".