51911 has 8 divisors (see below), whose sum is σ = 56544. Its totient is φ = 47520.

The previous prime is 51907. The next prime is 51913. The reversal of 51911 is 11915.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51911 - 2² = 51907 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 51911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51913) 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, 821 + ... + 881.

It is an arithmetic number, because the mean of its divisors is an integer number (7068).

2⁵¹⁹¹¹ is an apocalyptic number.

51911 is a deficient number, since it is larger than the sum of its proper divisors (4633).

51911 is a wasteful number, since it uses less digits than its factorization.

With its successor (51912) it forms an eRAP, since the sums of their prime factors are consecutive (121 and 122).

51911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121.

The product of its digits is 45, while the sum is 17.

The square root of 51911 is about 227.8398560393. The cubic root of 51911 is about 37.3038049532.

The spelling of 51911 in words is "fifty-one thousand, nine hundred eleven".