55615 has 12 divisors (see below), whose sum is σ = 77976.
Its totient is φ = 37968.
The previous prime is 55609. The next prime is 55619. The reversal of 55615 is 51655.
Adding to 55615 its product of digits (750), we get a palindrome (56365).
55615 = T21 + T22 + ... +
It is not a de Polignac number, because 55615 - 27 = 55487 is a prime.
It is a Duffinian number.
It is a nialpdrome in base 7.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (55619) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132 + ... + 358.
It is an arithmetic number, because the mean of its divisors is an integer number (6498).
255615 is an apocalyptic number.
55615 is a deficient number, since it is larger than the sum of its proper divisors (22361).
55615 is a wasteful number, since it uses less digits than its factorization.
55615 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 246 (or 239 counting only the distinct ones).
The product of its digits is 750, while the sum is 22.
The square root of 55615 is about 235.8283273909.
The cubic root of 55615 is about 38.1707459478.
The spelling of 55615 in words is "fifty-five thousand, six hundred fifteen".