55145143 has 4 divisors (see below), whose sum is σ = 55222560. Its totient is φ = 55067728.

The previous prime is 55145137. The next prime is 55145183. The reversal of 55145143 is 34154155.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55145143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55145183) 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, 37630 + ... + 39067.

It is an arithmetic number, because the mean of its divisors is an integer number (13805640).

Almost surely, 2^55145143 is an apocalyptic number.

55145143 is a deficient number, since it is larger than the sum of its proper divisors (77417).

55145143 is an equidigital number, since it uses as much as digits as its factorization.

55145143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77416.

The product of its digits is 6000, while the sum is 28.

The square root of 55145143 is about 7425.9775787434. The cubic root of 55145143 is about 380.6294806792.

Adding to 55145143 its reverse (34154155), we get a palindrome (89299298).

The spelling of 55145143 in words is "fifty-five million, one hundred forty-five thousand, one hundred forty-three".