51821359 has 4 divisors (see below), whose sum is σ = 51840520. Its totient is φ = 51802200.

The previous prime is 51821339. The next prime is 51821381. The reversal of 51821359 is 95312815.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51821359 - 2¹¹ = 51819311 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 (51821309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4692 + ... + 11209.

It is an arithmetic number, because the mean of its divisors is an integer number (12960130).

Almost surely, 2^51821359 is an apocalyptic number.

51821359 is a deficient number, since it is larger than the sum of its proper divisors (19161).

51821359 is a wasteful number, since it uses less digits than its factorization.

51821359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19160.

The product of its digits is 10800, while the sum is 34.

The square root of 51821359 is about 7198.7053697175. The cubic root of 51821359 is about 372.8232025160.

The spelling of 51821359 in words is "fifty-one million, eight hundred twenty-one thousand, three hundred fifty-nine".