51656847 has 16 divisors (see below), whose sum is σ = 77169792. Its totient is φ = 30460320.

The previous prime is 51656833. The next prime is 51656851. The reversal of 51656847 is 74865615.

It is not a de Polignac number, because 51656847 - 2⁷ = 51656719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51656799 and 51656808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51656747) 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, 19933 + ... + 22374.

It is an arithmetic number, because the mean of its divisors is an integer number (4823112).

Almost surely, 2^51656847 is an apocalyptic number.

51656847 is a deficient number, since it is larger than the sum of its proper divisors (25512945).

51656847 is a wasteful number, since it uses less digits than its factorization.

51656847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42358.

The product of its digits is 201600, while the sum is 42.

The square root of 51656847 is about 7187.2697876175. The cubic root of 51656847 is about 372.4282629899.

It can be divided in two parts, 516568 and 47, that added together give a palindrome (516615).

The spelling of 51656847 in words is "fifty-one million, six hundred fifty-six thousand, eight hundred forty-seven".