55143771 has 4 divisors (see below), whose sum is σ = 73525032. Its totient is φ = 36762512.

The previous prime is 55143749. The next prime is 55143773. The reversal of 55143771 is 17734155.

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 55143771 - 2¹⁵ = 55111003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55143773) 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, 9190626 + ... + 9190631.

It is an arithmetic number, because the mean of its divisors is an integer number (18381258).

Almost surely, 2^55143771 is an apocalyptic number.

55143771 is a deficient number, since it is larger than the sum of its proper divisors (18381261).

55143771 is a wasteful number, since it uses less digits than its factorization.

55143771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18381260.

The product of its digits is 14700, while the sum is 33.

The square root of 55143771 is about 7425.8851997590. The cubic root of 55143771 is about 380.6263239915.

The spelling of 55143771 in words is "fifty-five million, one hundred forty-three thousand, seven hundred seventy-one".