51805313 has 8 divisors (see below), whose sum is σ = 59350080. Its totient is φ = 44296560.

The previous prime is 51805301. The next prime is 51805319. The reversal of 51805313 is 31350815.

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

It is not a de Polignac number, because 51805313 - 2¹⁶ = 51739777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51805319) 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, 5843 + ... + 11736.

It is an arithmetic number, because the mean of its divisors is an integer number (7418760).

Almost surely, 2^51805313 is an apocalyptic number.

It is an amenable number.

51805313 is a deficient number, since it is larger than the sum of its proper divisors (7544767).

51805313 is a wasteful number, since it uses less digits than its factorization.

51805313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18007.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 51805313 is about 7197.5907774755. The cubic root of 51805313 is about 372.7847181357.

The spelling of 51805313 in words is "fifty-one million, eight hundred five thousand, three hundred thirteen".