51011 has 4 divisors (see below), whose sum is σ = 52800. Its totient is φ = 49224.

The previous prime is 51001. The next prime is 51031. The reversal of 51011 is 11015.

It is a happy number.

51011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11015 = 5 ⋅2203.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51011 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 51011.

It is not an unprimeable number, because it can be changed into a prime (51001) 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, 851 + ... + 908.

It is an arithmetic number, because the mean of its divisors is an integer number (13200).

2⁵¹⁰¹¹ is an apocalyptic number.

51011 is a deficient number, since it is larger than the sum of its proper divisors (1789).

51011 is a wasteful number, since it uses less digits than its factorization.

51011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788.

The product of its (nonzero) digits is 5, while the sum is 8.

The square root of 51011 is about 225.8561489090. The cubic root of 51011 is about 37.0869636923.

Adding to 51011 its reverse (11015), we get a palindrome (62026).

The spelling of 51011 in words is "fifty-one thousand, eleven".