51766421 has 8 divisors (see below), whose sum is σ = 61201920. Its totient is φ = 42841008.

The previous prime is 51766381. The next prime is 51766457. The reversal of 51766421 is 12466715.

51766421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51766421 - 2²² = 47572117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51766471) 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 7 ways as a sum of consecutive naturals, for example, 127301 + ... + 127706.

It is an arithmetic number, because the mean of its divisors is an integer number (7650240).

Almost surely, 2^51766421 is an apocalyptic number.

It is an amenable number.

51766421 is a deficient number, since it is larger than the sum of its proper divisors (9435499).

51766421 is a wasteful number, since it uses less digits than its factorization.

51766421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255043.

The product of its digits is 10080, while the sum is 32.

The square root of 51766421 is about 7194.8885328405. Note that the first 3 decimals coincide. The cubic root of 51766421 is about 372.6914074174.

The spelling of 51766421 in words is "fifty-one million, seven hundred sixty-six thousand, four hundred twenty-one".