51155552 has 96 divisors (see below), whose sum is σ = 121347072. Its totient is φ = 20772864.

The previous prime is 51155551. The next prime is 51155561. The reversal of 51155552 is 25555115.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155551) 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, 452648 + ... + 452760.

It is an arithmetic number, because the mean of its divisors is an integer number (1264032).

Almost surely, 2^51155552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51155552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60673536).

51155552 is an abundant number, since it is smaller than the sum of its proper divisors (70191520).

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

51155552 is a wasteful number, since it uses less digits than its factorization.

51155552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 212 counting only the distinct ones).

The product of its digits is 6250, while the sum is 29.

The square root of 51155552 is about 7152.3109552088. The cubic root of 51155552 is about 371.2196227984.

The spelling of 51155552 in words is "fifty-one million, one hundred fifty-five thousand, five hundred fifty-two".