51805339 has 4 divisors (see below), whose sum is σ = 53591760. Its totient is φ = 50018920.

The previous prime is 51805337. The next prime is 51805349. The reversal of 51805339 is 93350815.

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 51805339 - 2¹ = 51805337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51805337) 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, 893167 + ... + 893224.

It is an arithmetic number, because the mean of its divisors is an integer number (13397940).

Almost surely, 2^51805339 is an apocalyptic number.

51805339 is a deficient number, since it is larger than the sum of its proper divisors (1786421).

51805339 is a wasteful number, since it uses less digits than its factorization.

51805339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786420.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 51805339 is about 7197.5925836352. The cubic root of 51805339 is about 372.7847804999.

The spelling of 51805339 in words is "fifty-one million, eight hundred five thousand, three hundred thirty-nine".