51366521 has 8 divisors (see below), whose sum is σ = 54509760. Its totient is φ = 48299152.

The previous prime is 51366517. The next prime is 51366529. The reversal of 51366521 is 12566315.

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

It is a cyclic number.

It is not a de Polignac number, because 51366521 - 2² = 51366517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51366529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17570 + ... + 20283.

It is an arithmetic number, because the mean of its divisors is an integer number (6813720).

Almost surely, 2^51366521 is an apocalyptic number.

It is an amenable number.

51366521 is a deficient number, since it is larger than the sum of its proper divisors (3143239).

51366521 is a wasteful number, since it uses less digits than its factorization.

51366521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37935.

The product of its digits is 5400, while the sum is 29.

The square root of 51366521 is about 7167.0440908369. The cubic root of 51366521 is about 371.7292345973.

The spelling of 51366521 in words is "fifty-one million, three hundred sixty-six thousand, five hundred twenty-one".