102189055 has 4 divisors (see below), whose sum is σ = 122626872. Its totient is φ = 81751240.

The previous prime is 102189041. The next prime is 102189067. The reversal of 102189055 is 550981201.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 102189055 - 2⁹ = 102188543 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10218901 + ... + 10218910.

It is an arithmetic number, because the mean of its divisors is an integer number (30656718).

Almost surely, 2^102189055 is an apocalyptic number.

102189055 is a deficient number, since it is larger than the sum of its proper divisors (20437817).

102189055 is an equidigital number, since it uses as much as digits as its factorization.

102189055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20437816.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 102189055 is about 10108.8602225968. The cubic root of 102189055 is about 467.5213636610.

The spelling of 102189055 in words is "one hundred two million, one hundred eighty-nine thousand, fifty-five".