228215231 has 4 divisors (see below), whose sum is σ = 229957464. Its totient is φ = 226473000.

The previous prime is 228215227. The next prime is 228215237. The reversal of 228215231 is 132512822.

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 228215231 - 2² = 228215227 is a prime.

It is a super-2 number, since 2×228215231² = 104164383320766722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 228215231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228215237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 870920 + ... + 871181.

It is an arithmetic number, because the mean of its divisors is an integer number (57489366).

Almost surely, 2^228215231 is an apocalyptic number.

228215231 is a deficient number, since it is larger than the sum of its proper divisors (1742233).

228215231 is a wasteful number, since it uses less digits than its factorization.

228215231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1742232.

The product of its digits is 1920, while the sum is 26.

The square root of 228215231 is about 15106.7941999618. The cubic root of 228215231 is about 611.1036465559.

The spelling of 228215231 in words is "two hundred twenty-eight million, two hundred fifteen thousand, two hundred thirty-one".