55142443 has 4 divisors (see below), whose sum is σ = 55242000. Its totient is φ = 55042888.

The previous prime is 55142429. The next prime is 55142447. The reversal of 55142443 is 34424155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34424155 = 5 ⋅6884831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55142443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55142447) 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, 48943 + ... + 50056.

It is an arithmetic number, because the mean of its divisors is an integer number (13810500).

Almost surely, 2^55142443 is an apocalyptic number.

55142443 is a deficient number, since it is larger than the sum of its proper divisors (99557).

55142443 is an equidigital number, since it uses as much as digits as its factorization.

55142443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99556.

The product of its digits is 9600, while the sum is 28.

The square root of 55142443 is about 7425.7957822714. The cubic root of 55142443 is about 380.6232684888.

Adding to 55142443 its reverse (34424155), we get a palindrome (89566598).

The spelling of 55142443 in words is "fifty-five million, one hundred forty-two thousand, four hundred forty-three".