51841865 has 4 divisors (see below), whose sum is σ = 62210244. Its totient is φ = 41473488.

The previous prime is 51841841. The next prime is 51841873. The reversal of 51841865 is 56814815.

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 9174841 + 42667024 = 3029^2 + 6532^2 .

It is a cyclic number.

It is not a de Polignac number, because 51841865 - 2¹² = 51837769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5184182 + ... + 5184191.

It is an arithmetic number, because the mean of its divisors is an integer number (15552561).

Almost surely, 2^51841865 is an apocalyptic number.

It is an amenable number.

51841865 is a deficient number, since it is larger than the sum of its proper divisors (10368379).

51841865 is a wasteful number, since it uses less digits than its factorization.

51841865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10368378.

The product of its digits is 38400, while the sum is 38.

The square root of 51841865 is about 7200.1295127241. The cubic root of 51841865 is about 372.8723721027.

The spelling of 51841865 in words is "fifty-one million, eight hundred forty-one thousand, eight hundred sixty-five".