228629381 has 2 divisors, whose sum is σ = 228629382. Its totient is φ = 228629380.

The previous prime is 228629369. The next prime is 228629411. The reversal of 228629381 is 183926822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226021156 + 2608225 = 15034^2 + 1615^2 .

It is a cyclic number.

It is not a de Polignac number, because 228629381 - 2¹⁰ = 228628357 is a prime.

It is a super-2 number, since 2×228629381² = 104542787712886322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228629351) 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, 114314690 + 114314691.

It is an arithmetic number, because the mean of its divisors is an integer number (114314691).

Almost surely, 2^228629381 is an apocalyptic number.

It is an amenable number.

228629381 is a deficient number, since it is larger than the sum of its proper divisors (1).

228629381 is an equidigital number, since it uses as much as digits as its factorization.

228629381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 41.

The square root of 228629381 is about 15120.4953953235. The cubic root of 228629381 is about 611.4730867434.

The spelling of 228629381 in words is "two hundred twenty-eight million, six hundred twenty-nine thousand, three hundred eighty-one".