229818521 has 2 divisors, whose sum is σ = 229818522. Its totient is φ = 229818520.

The previous prime is 229818499. The next prime is 229818557. The reversal of 229818521 is 125818922.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121242121 + 108576400 = 11011^2 + 10420^2 .

It is a cyclic number.

It is not a de Polignac number, because 229818521 - 2¹⁴ = 229802137 is a prime.

It is not a weakly prime, because it can be changed into another prime (229811521) 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, 114909260 + 114909261.

It is an arithmetic number, because the mean of its divisors is an integer number (114909261).

Almost surely, 2^229818521 is an apocalyptic number.

It is an amenable number.

229818521 is a deficient number, since it is larger than the sum of its proper divisors (1).

229818521 is an equidigital number, since it uses as much as digits as its factorization.

229818521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 38.

The square root of 229818521 is about 15159.7665219488. The cubic root of 229818521 is about 612.5313789838.

The spelling of 229818521 in words is "two hundred twenty-nine million, eight hundred eighteen thousand, five hundred twenty-one".