51271620 has 24 divisors (see below), whose sum is σ = 143560704. Its totient is φ = 13672416.

The previous prime is 51271589. The next prime is 51271621. The reversal of 51271620 is 2617215.

51271620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51271621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427204 + ... + 427323.

It is an arithmetic number, because the mean of its divisors is an integer number (5981696).

Almost surely, 2^51271620 is an apocalyptic number.

It is an amenable number.

51271620 is an abundant number, since it is smaller than the sum of its proper divisors (92289084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51271620 is a wasteful number, since it uses less digits than its factorization.

51271620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854539 (or 854537 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 51271620 is about 7160.4203787208. The cubic root of 51271620 is about 371.5001669537.

Adding to 51271620 its reverse (2617215), we get a palindrome (53888835).

The spelling of 51271620 in words is "fifty-one million, two hundred seventy-one thousand, six hundred twenty".