51556047 has 4 divisors (see below), whose sum is σ = 68741400. Its totient is φ = 34370696.

The previous prime is 51556033. The next prime is 51556049. The reversal of 51556047 is 74065515.

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 51556047 - 2²⁴ = 34778831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51555999 and 51556017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51556049) 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, 8592672 + ... + 8592677.

It is an arithmetic number, because the mean of its divisors is an integer number (17185350).

Almost surely, 2^51556047 is an apocalyptic number.

51556047 is a deficient number, since it is larger than the sum of its proper divisors (17185353).

51556047 is a wasteful number, since it uses less digits than its factorization.

51556047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17185352.

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 51556047 is about 7180.2539648678. The cubic root of 51556047 is about 372.1858607022.

The spelling of 51556047 in words is "fifty-one million, five hundred fifty-six thousand, forty-seven".