51655212 has 144 divisors (see below), whose sum is σ = 160110720. Its totient is φ = 14351904.

The previous prime is 51655211. The next prime is 51655223. The reversal of 51655212 is 21255615.

51655212 is a `hidden beast` number, since 5 + 1 + 655 + 2 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51655211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 227443 + ... + 227669.

It is an arithmetic number, because the mean of its divisors is an integer number (1111880).

Almost surely, 2^51655212 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 51655212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80055360).

51655212 is an abundant number, since it is smaller than the sum of its proper divisors (108455508).

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

51655212 is a wasteful number, since it uses less digits than its factorization.

51655212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 282 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 51655212 is about 7187.1560439439. The cubic root of 51655212 is about 372.4243336842.

The spelling of 51655212 in words is "fifty-one million, six hundred fifty-five thousand, two hundred twelve".