51491160 has 256 divisors, whose sum is σ = 201600000. Its totient is φ = 11684736.

The previous prime is 51491149. The next prime is 51491183. The reversal of 51491160 is 6119415.

51491160 is a `hidden beast` number, since 514 + 91 + 1 + 60 = 666.

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

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 63 ways as a sum of consecutive naturals, for example, 370371 + ... + 370509.

It is an arithmetic number, because the mean of its divisors is an integer number (787500).

Almost surely, 2^51491160 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 51491160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100800000).

51491160 is an abundant number, since it is smaller than the sum of its proper divisors (150108840).

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

51491160 is a wasteful number, since it uses less digits than its factorization.

51491160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 51491160 is about 7175.7341087864. The cubic root of 51491160 is about 372.0296542437.

The spelling of 51491160 in words is "fifty-one million, four hundred ninety-one thousand, one hundred sixty".