228191189 has 4 divisors (see below), whose sum is σ = 228274080. Its totient is φ = 228108300.

The previous prime is 228191149. The next prime is 228191209. The reversal of 228191189 is 981191822.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-228191189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228191149) 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, 37169 + ... + 42870.

It is an arithmetic number, because the mean of its divisors is an integer number (57068520).

Almost surely, 2^228191189 is an apocalyptic number.

It is an amenable number.

228191189 is a deficient number, since it is larger than the sum of its proper divisors (82891).

228191189 is an equidigital number, since it uses as much as digits as its factorization.

228191189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82890.

The product of its digits is 20736, while the sum is 41.

The square root of 228191189 is about 15105.9984443267. The cubic root of 228191189 is about 611.0821863028.

The spelling of 228191189 in words is "two hundred twenty-eight million, one hundred ninety-one thousand, one hundred eighty-nine".