228905291 has 2 divisors, whose sum is σ = 228905292. Its totient is φ = 228905290.

The previous prime is 228905233. The next prime is 228905311. The reversal of 228905291 is 192509822.

228905291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228905291 - 2⁶ = 228905227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (228905231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114452645 + 114452646.

It is an arithmetic number, because the mean of its divisors is an integer number (114452646).

Almost surely, 2^228905291 is an apocalyptic number.

228905291 is a deficient number, since it is larger than the sum of its proper divisors (1).

228905291 is an equidigital number, since it uses as much as digits as its factorization.

228905291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 228905291 is about 15129.6163533647. The cubic root of 228905291 is about 611.7189631586.

The spelling of 228905291 in words is "two hundred twenty-eight million, nine hundred five thousand, two hundred ninety-one".