51806273 has 4 divisors (see below), whose sum is σ = 52179120. Its totient is φ = 51433428.

The previous prime is 51806269. The next prime is 51806299. The reversal of 51806273 is 37260815.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37260815 = 5 ⋅7452163.

It is a cyclic number.

It is not a de Polignac number, because 51806273 - 2² = 51806269 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51806203) 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, 186215 + ... + 186492.

It is an arithmetic number, because the mean of its divisors is an integer number (13044780).

Almost surely, 2^51806273 is an apocalyptic number.

It is an amenable number.

51806273 is a deficient number, since it is larger than the sum of its proper divisors (372847).

51806273 is a wasteful number, since it uses less digits than its factorization.

51806273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372846.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 51806273 is about 7197.6574661483. The cubic root of 51806273 is about 372.7870208024.

The spelling of 51806273 in words is "fifty-one million, eight hundred six thousand, two hundred seventy-three".