55143861 has 4 divisors (see below), whose sum is σ = 73525152. Its totient is φ = 36762572.

The previous prime is 55143859. The next prime is 55143883. The reversal of 55143861 is 16834155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55143861 - 2¹ = 55143859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55143961) 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, 9190641 + ... + 9190646.

It is an arithmetic number, because the mean of its divisors is an integer number (18381288).

Almost surely, 2^55143861 is an apocalyptic number.

It is an amenable number.

55143861 is a deficient number, since it is larger than the sum of its proper divisors (18381291).

55143861 is a wasteful number, since it uses less digits than its factorization.

55143861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18381290.

The product of its digits is 14400, while the sum is 33.

The square root of 55143861 is about 7425.8912596402. The cubic root of 55143861 is about 380.6265310645.

It can be divided in two parts, 55 and 143861, that added together give a triangular number (143916 = T₅₃₆).

The spelling of 55143861 in words is "fifty-five million, one hundred forty-three thousand, eight hundred sixty-one".