51786851 has 4 divisors (see below), whose sum is σ = 51803304. Its totient is φ = 51770400.

The previous prime is 51786829. The next prime is 51786859. The reversal of 51786851 is 15868715.

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 51786851 - 2²² = 47592547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51786799 and 51786808.

It is not an unprimeable number, because it can be changed into a prime (51786859) 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, 1865 + ... + 10346.

It is an arithmetic number, because the mean of its divisors is an integer number (12950826).

Almost surely, 2^51786851 is an apocalyptic number.

51786851 is a deficient number, since it is larger than the sum of its proper divisors (16453).

51786851 is a wasteful number, since it uses less digits than its factorization.

51786851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16452.

The product of its digits is 67200, while the sum is 41.

The square root of 51786851 is about 7196.3081507117. The cubic root of 51786851 is about 372.7404294402.

The spelling of 51786851 in words is "fifty-one million, seven hundred eighty-six thousand, eight hundred fifty-one".