228724129 has 2 divisors, whose sum is σ = 228724130. Its totient is φ = 228724128.

The previous prime is 228724127. The next prime is 228724193. The reversal of 228724129 is 921427822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175827600 + 52896529 = 13260^2 + 7273^2 .

It is a cyclic number.

It is not a de Polignac number, because 228724129 - 2¹ = 228724127 is a prime.

Together with 228724127, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (228724123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114362064 + 114362065.

It is an arithmetic number, because the mean of its divisors is an integer number (114362065).

Almost surely, 2^228724129 is an apocalyptic number.

It is an amenable number.

228724129 is a deficient number, since it is larger than the sum of its proper divisors (1).

228724129 is an equidigital number, since it uses as much as digits as its factorization.

228724129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 228724129 is about 15123.6281691927. The cubic root of 228724129 is about 611.5575434457.

The spelling of 228724129 in words is "two hundred twenty-eight million, seven hundred twenty-four thousand, one hundred twenty-nine".