55985143 has 4 divisors (see below), whose sum is σ = 56014128. Its totient is φ = 55956160.

The previous prime is 55985141. The next prime is 55985161. The reversal of 55985143 is 34158955.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55985143 - 2¹ = 55985141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55985096 and 55985105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55985141) 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, 11371 + ... + 15532.

It is an arithmetic number, because the mean of its divisors is an integer number (14003532).

Almost surely, 2^55985143 is an apocalyptic number.

55985143 is a deficient number, since it is larger than the sum of its proper divisors (28985).

55985143 is a wasteful number, since it uses less digits than its factorization.

55985143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28984.

The product of its digits is 108000, while the sum is 40.

The square root of 55985143 is about 7482.3220326313. The cubic root of 55985143 is about 382.5523997303.

The spelling of 55985143 in words is "fifty-five million, nine hundred eighty-five thousand, one hundred forty-three".