228181231 has 2 divisors, whose sum is σ = 228181232. Its totient is φ = 228181230.

The previous prime is 228181189. The next prime is 228181253. The reversal of 228181231 is 132181822.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228181231 - 2²⁵ = 194626799 is a prime.

It is a super-2 number, since 2×228181231² = 104133348361350722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 228181231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228181931) 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 as a sum of consecutive naturals, namely, 114090615 + 114090616.

It is an arithmetic number, because the mean of its divisors is an integer number (114090616).

Almost surely, 2^228181231 is an apocalyptic number.

228181231 is a deficient number, since it is larger than the sum of its proper divisors (1).

228181231 is an equidigital number, since it uses as much as digits as its factorization.

228181231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 28.

The square root of 228181231 is about 15105.6688365660. The cubic root of 228181231 is about 611.0732971999.

The spelling of 228181231 in words is "two hundred twenty-eight million, one hundred eighty-one thousand, two hundred thirty-one".