51481170 has 80 divisors (see below), whose sum is σ = 149105880. Its totient is φ = 12669696.

The previous prime is 51481163. The next prime is 51481181. The reversal of 51481170 is 7118415.

51481170 is a `hidden beast` number, since 514 + 81 + 1 + 70 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 37124649 + 14356521 = 6093^2 + 3789^2 .

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

It is a Curzon number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8086 + ... + 12974.

Almost surely, 2^51481170 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51481170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74552940).

51481170 is an abundant number, since it is smaller than the sum of its proper divisors (97624710).

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

51481170 is a wasteful number, since it uses less digits than its factorization.

51481170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4921 (or 4912 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 51481170 is about 7175.0379789936. The cubic root of 51481170 is about 372.0055930481.

Adding to 51481170 its reverse (7118415), we get a palindrome (58599585).

The spelling of 51481170 in words is "fifty-one million, four hundred eighty-one thousand, one hundred seventy".