51216503 has 16 divisors (see below), whose sum is σ = 56866656. Its totient is φ = 45826560.

The previous prime is 51216493. The next prime is 51216509. The reversal of 51216503 is 30561215.

It is not a de Polignac number, because 51216503 - 2⁶ = 51216439 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 (51216509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163475 + ... + 163787.

It is an arithmetic number, because the mean of its divisors is an integer number (3554166).

Almost surely, 2^51216503 is an apocalyptic number.

51216503 is a deficient number, since it is larger than the sum of its proper divisors (5650153).

51216503 is a wasteful number, since it uses less digits than its factorization.

51216503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 51216503 is about 7156.5706172719. The cubic root of 51216503 is about 371.3669983098.

Adding to 51216503 its reverse (30561215), we get a palindrome (81777718).

The spelling of 51216503 in words is "fifty-one million, two hundred sixteen thousand, five hundred three".