55172143 has 16 divisors (see below), whose sum is σ = 64244320. Its totient is φ = 46935936.

The previous prime is 55172129. The next prime is 55172149. The reversal of 55172143 is 34127155.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 55172143 - 2⁵ = 55172111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55172149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6121 + ... + 12157.

It is an arithmetic number, because the mean of its divisors is an integer number (4015270).

Almost surely, 2^55172143 is an apocalyptic number.

55172143 is a deficient number, since it is larger than the sum of its proper divisors (9072177).

55172143 is a wasteful number, since it uses less digits than its factorization.

55172143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6106.

The product of its digits is 4200, while the sum is 28.

The square root of 55172143 is about 7427.7952987411. The cubic root of 55172143 is about 380.6915914328.

Adding to 55172143 its reverse (34127155), we get a palindrome (89299298).

The spelling of 55172143 in words is "fifty-five million, one hundred seventy-two thousand, one hundred forty-three".