55140143 has 4 divisors (see below), whose sum is σ = 55158648. Its totient is φ = 55121640.

The previous prime is 55140139. The next prime is 55140167. The reversal of 55140143 is 34104155.

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 55140143 - 2² = 55140139 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 (55140133) 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, 3653 + ... + 11118.

It is an arithmetic number, because the mean of its divisors is an integer number (13789662).

Almost surely, 2^55140143 is an apocalyptic number.

55140143 is a deficient number, since it is larger than the sum of its proper divisors (18505).

55140143 is a wasteful number, since it uses less digits than its factorization.

55140143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18504.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 55140143 is about 7425.6409150995. The cubic root of 55140143 is about 380.6179764631.

Adding to 55140143 its reverse (34104155), we get a palindrome (89244298).

The spelling of 55140143 in words is "fifty-five million, one hundred forty thousand, one hundred forty-three".