51838687 has 4 divisors (see below), whose sum is σ = 52548880. Its totient is φ = 51128496.

The previous prime is 51838663. The next prime is 51838723. The reversal of 51838687 is 78683815.

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 51838687 - 2¹⁹ = 51314399 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 (51838387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354987 + ... + 355132.

It is an arithmetic number, because the mean of its divisors is an integer number (13137220).

Almost surely, 2^51838687 is an apocalyptic number.

51838687 is a deficient number, since it is larger than the sum of its proper divisors (710193).

51838687 is an equidigital number, since it uses as much as digits as its factorization.

51838687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710192.

The product of its digits is 322560, while the sum is 46.

The square root of 51838687 is about 7199.9088188671. The cubic root of 51838687 is about 372.8647526969.

It can be divided in two parts, 51838 and 687, that added together give a palindrome (52525).

The spelling of 51838687 in words is "fifty-one million, eight hundred thirty-eight thousand, six hundred eighty-seven".