229008781 has 2 divisors, whose sum is σ = 229008782. Its totient is φ = 229008780.

The previous prime is 229008779. The next prime is 229008817. The reversal of 229008781 is 187800922.

Together with next prime (229008817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188622756 + 40386025 = 13734^2 + 6355^2 .

It is a cyclic number.

It is not a de Polignac number, because 229008781 - 2¹ = 229008779 is a prime.

It is a super-3 number, since 3×229008781³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 229008779, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 229008781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229008721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114504390 + 114504391.

It is an arithmetic number, because the mean of its divisors is an integer number (114504391).

Almost surely, 2^229008781 is an apocalyptic number.

It is an amenable number.

229008781 is a deficient number, since it is larger than the sum of its proper divisors (1).

229008781 is an equidigital number, since it uses as much as digits as its factorization.

229008781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 229008781 is about 15133.0360800469. The cubic root of 229008781 is about 611.8111370253.

The spelling of 229008781 in words is "two hundred twenty-nine million, eight thousand, seven hundred eighty-one".