51847621 has 32 divisors (see below), whose sum is σ = 64281600. Its totient is φ = 40884480.

The previous prime is 51847613. The next prime is 51847651. The reversal of 51847621 is 12674815.

It is not a de Polignac number, because 51847621 - 2³ = 51847613 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 (51847651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 656260 + ... + 656338.

It is an arithmetic number, because the mean of its divisors is an integer number (2008800).

Almost surely, 2^51847621 is an apocalyptic number.

It is an amenable number.

51847621 is a deficient number, since it is larger than the sum of its proper divisors (12433979).

51847621 is a wasteful number, since it uses less digits than its factorization.

51847621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229.

The product of its digits is 13440, while the sum is 34.

The square root of 51847621 is about 7200.5292166618. The cubic root of 51847621 is about 372.8861715930.

The spelling of 51847621 in words is "fifty-one million, eight hundred forty-seven thousand, six hundred twenty-one".