51805241 has 4 divisors (see below), whose sum is σ = 51827172. Its totient is φ = 51783312.

The previous prime is 51805219. The next prime is 51805279. The reversal of 51805241 is 14250815.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13104400 + 38700841 = 3620^2 + 6221^2 .

It is a cyclic number.

It is not a de Polignac number, because 51805241 - 2¹⁰ = 51804217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51805241.

It is not an unprimeable number, because it can be changed into a prime (51805541) 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, 6926 + ... + 12311.

It is an arithmetic number, because the mean of its divisors is an integer number (12956793).

Almost surely, 2^51805241 is an apocalyptic number.

It is an amenable number.

51805241 is a deficient number, since it is larger than the sum of its proper divisors (21931).

51805241 is a wasteful number, since it uses less digits than its factorization.

51805241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21930.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 51805241 is about 7197.5857758001. The cubic root of 51805241 is about 372.7845454345.

The spelling of 51805241 in words is "fifty-one million, eight hundred five thousand, two hundred forty-one".