55511 has 2 divisors, whose sum is σ = 55512. Its totient is φ = 55510.

The previous prime is 55501. The next prime is 55529. The reversal of 55511 is 11555.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55511 is a prime.

It is a super-2 number, since 2×55511² = 6162942242, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 15.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 55511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27755 + 27756.

It is an arithmetic number, because the mean of its divisors is an integer number (27756).

2⁵⁵⁵¹¹ is an apocalyptic number.

55511 is a deficient number, since it is larger than the sum of its proper divisors (1).

55511 is an equidigital number, since it uses as much as digits as its factorization.

55511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125, while the sum is 17.

The square root of 55511 is about 235.6077248309. The cubic root of 55511 is about 38.1469380144.

Subtracting from 55511 its reverse (11555), we obtain a triangular number (43956 = T₂₉₆).

It can be divided in two parts, 555 and 11, that multiplied together give a triangular number (6105 = T₁₁₀).

The spelling of 55511 in words is "fifty-five thousand, five hundred eleven".