51780521 has 32 divisors (see below), whose sum is σ = 62995968. Its totient is φ = 42071040.

The previous prime is 51780503. The next prime is 51780527. The reversal of 51780521 is 12508715.

51780521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51780521 - 2¹⁴ = 51764137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51780527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 309980 + ... + 310146.

It is an arithmetic number, because the mean of its divisors is an integer number (1968624).

Almost surely, 2^51780521 is an apocalyptic number.

It is an amenable number.

51780521 is a deficient number, since it is larger than the sum of its proper divisors (11215447).

51780521 is a wasteful number, since it uses less digits than its factorization.

51780521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 51780521 is about 7195.8683284229. The cubic root of 51780521 is about 372.7252419102.

The spelling of 51780521 in words is "fifty-one million, seven hundred eighty thousand, five hundred twenty-one".