51085047 has 16 divisors (see below), whose sum is σ = 76543488. Its totient is φ = 30069600.

The previous prime is 51085039. The next prime is 51085061. The reversal of 51085047 is 74058015.

It is not a de Polignac number, because 51085047 - 2³ = 51085039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51085087) 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, 27579 + ... + 29372.

It is an arithmetic number, because the mean of its divisors is an integer number (4783968).

Almost surely, 2^51085047 is an apocalyptic number.

51085047 is a deficient number, since it is larger than the sum of its proper divisors (25458441).

51085047 is a wasteful number, since it uses less digits than its factorization.

51085047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56990.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 51085047 is about 7147.3804292202. The cubic root of 51085047 is about 371.0490002435.

The spelling of 51085047 in words is "fifty-one million, eighty-five thousand, forty-seven".