51655511 has 8 divisors (see below), whose sum is σ = 52390800. Its totient is φ = 50923840.

The previous prime is 51655501. The next prime is 51655519. The reversal of 51655511 is 11555615.

It is a happy number.

51655511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51655511 - 2¹⁰ = 51654487 is a prime.

It is a super-2 number, since 2×51655511² = 5336583633342242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51655519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40400 + ... + 41658.

It is an arithmetic number, because the mean of its divisors is an integer number (6548850).

Almost surely, 2^51655511 is an apocalyptic number.

51655511 is a deficient number, since it is larger than the sum of its proper divisors (735289).

51655511 is a wasteful number, since it uses less digits than its factorization.

51655511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809.

The product of its digits is 3750, while the sum is 29.

The square root of 51655511 is about 7187.1768449093. The cubic root of 51655511 is about 372.4250522607.

The spelling of 51655511 in words is "fifty-one million, six hundred fifty-five thousand, five hundred eleven".