228138539 has 2 divisors, whose sum is σ = 228138540. Its totient is φ = 228138538.

The previous prime is 228138523. The next prime is 228138569. The reversal of 228138539 is 935831822.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228138539 - 2⁴ = 228138523 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 228138496 and 228138505.

It is not a weakly prime, because it can be changed into another prime (228138509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114069269 + 114069270.

It is an arithmetic number, because the mean of its divisors is an integer number (114069270).

Almost surely, 2^228138539 is an apocalyptic number.

228138539 is a deficient number, since it is larger than the sum of its proper divisors (1).

228138539 is an equidigital number, since it uses as much as digits as its factorization.

228138539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 228138539 is about 15104.2556585884. The cubic root of 228138539 is about 611.0351848505.

The spelling of 228138539 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, five hundred thirty-nine".