51505383 has 4 divisors (see below), whose sum is σ = 68673848. Its totient is φ = 34336920.

The previous prime is 51505381. The next prime is 51505397. The reversal of 51505383 is 38350515.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51505383 - 2¹ = 51505381 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51505383.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51505381) 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, 8584228 + ... + 8584233.

It is an arithmetic number, because the mean of its divisors is an integer number (17168462).

Almost surely, 2^51505383 is an apocalyptic number.

51505383 is a deficient number, since it is larger than the sum of its proper divisors (17168465).

51505383 is a wasteful number, since it uses less digits than its factorization.

51505383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17168464.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 51505383 is about 7176.7250887853. The cubic root of 51505383 is about 372.0639053699.

Adding to 51505383 its reverse (38350515), we get a palindrome (89855898).

The spelling of 51505383 in words is "fifty-one million, five hundred five thousand, three hundred eighty-three".