51155320 has 32 divisors (see below), whose sum is σ = 115305120. Its totient is φ = 20425600.

The previous prime is 51155311. The next prime is 51155347. The reversal of 51155320 is 2355115.

It is a junction number, because it is equal to n+sod(n) for n = 51155291 and 51155300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38670 + ... + 39970.

It is an arithmetic number, because the mean of its divisors is an integer number (3603285).

Almost surely, 2^51155320 is an apocalyptic number.

It is an amenable number.

51155320 is an abundant number, since it is smaller than the sum of its proper divisors (64149800).

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

51155320 is a wasteful number, since it uses less digits than its factorization.

51155320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2295 (or 2291 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 51155320 is about 7152.2947366562. The cubic root of 51155320 is about 371.2190616140.

The spelling of 51155320 in words is "fifty-one million, one hundred fifty-five thousand, three hundred twenty".