228221137 has 2 divisors, whose sum is σ = 228221138. Its totient is φ = 228221136.

The previous prime is 228221093. The next prime is 228221173. The reversal of 228221137 is 731122822.

Together with next prime (228221173) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225120016 + 3101121 = 15004^2 + 1761^2 .

It is a cyclic number.

It is not a de Polignac number, because 228221137 - 2¹⁵ = 228188369 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (228221177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114110568 + 114110569.

It is an arithmetic number, because the mean of its divisors is an integer number (114110569).

Almost surely, 2^228221137 is an apocalyptic number.

It is an amenable number.

228221137 is a deficient number, since it is larger than the sum of its proper divisors (1).

228221137 is an equidigital number, since it uses as much as digits as its factorization.

228221137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 228221137 is about 15106.9896736577. The cubic root of 228221137 is about 611.1089181103.

Adding to 228221137 its reverse (731122822), we get a palindrome (959343959).

The spelling of 228221137 in words is "two hundred twenty-eight million, two hundred twenty-one thousand, one hundred thirty-seven".