226521191 has 4 divisors (see below), whose sum is σ = 243945912. Its totient is φ = 209096472.

The previous prime is 226521179. The next prime is 226521199. The reversal of 226521191 is 191125622.

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

It is a de Polignac number, because none of the positive numbers 2^k-226521191 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 (226521199) 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, 8712341 + ... + 8712366.

It is an arithmetic number, because the mean of its divisors is an integer number (60986478).

Almost surely, 2^226521191 is an apocalyptic number.

226521191 is a deficient number, since it is larger than the sum of its proper divisors (17424721).

226521191 is a wasteful number, since it uses less digits than its factorization.

226521191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17424720.

The product of its digits is 2160, while the sum is 29.

The square root of 226521191 is about 15050.6209506452. The cubic root of 226521191 is about 609.5878170407.

The spelling of 226521191 in words is "two hundred twenty-six million, five hundred twenty-one thousand, one hundred ninety-one".