228138523 has 2 divisors, whose sum is σ = 228138524. Its totient is φ = 228138522.

The previous prime is 228138509. The next prime is 228138539. The reversal of 228138523 is 325831822.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228138523 is a prime.

It is not a weakly prime, because it can be changed into another prime (228138503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114069261 + 114069262.

It is an arithmetic number, because the mean of its divisors is an integer number (114069262).

Almost surely, 2^228138523 is an apocalyptic number.

228138523 is a deficient number, since it is larger than the sum of its proper divisors (1).

228138523 is an equidigital number, since it uses as much as digits as its factorization.

228138523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 34.

The square root of 228138523 is about 15104.2551289363. The cubic root of 228138523 is about 611.0351705660.

It can be divided in two parts, 2281 and 38523, that added together give a palindrome (40804).

The spelling of 228138523 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, five hundred twenty-three".