51320503 has 8 divisors (see below), whose sum is σ = 55512800. Its totient is φ = 47163168.

The previous prime is 51320497. The next prime is 51320509. The reversal of 51320503 is 30502315.

It is an interprime number because it is at equal distance from previous prime (51320497) and next prime (51320509).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51320503 - 2²¹ = 49223351 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 (51320509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5643 + ... + 11596.

It is an arithmetic number, because the mean of its divisors is an integer number (6939100).

Almost surely, 2^51320503 is an apocalyptic number.

51320503 is a deficient number, since it is larger than the sum of its proper divisors (4192297).

51320503 is a wasteful number, since it uses less digits than its factorization.

51320503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17481.

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 51320503 is about 7163.8329824194. The cubic root of 51320503 is about 371.6181937450.

Adding to 51320503 its reverse (30502315), we get a palindrome (81822818).

The spelling of 51320503 in words is "fifty-one million, three hundred twenty thousand, five hundred three".