55198111 has 4 divisors (see below), whose sum is σ = 56481832. Its totient is φ = 53914392.

The previous prime is 55198109. The next prime is 55198123. The reversal of 55198111 is 11189155.

55198111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55198111 - 2¹ = 55198109 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 (55198511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641796 + ... + 641881.

It is an arithmetic number, because the mean of its divisors is an integer number (14120458).

Almost surely, 2^55198111 is an apocalyptic number.

55198111 is a deficient number, since it is larger than the sum of its proper divisors (1283721).

55198111 is a wasteful number, since it uses less digits than its factorization.

55198111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283720.

The product of its digits is 1800, while the sum is 31.

The square root of 55198111 is about 7429.5431218885. The cubic root of 55198111 is about 380.7513090615.

The spelling of 55198111 in words is "fifty-five million, one hundred ninety-eight thousand, one hundred eleven".