228781789 has 2 divisors, whose sum is σ = 228781790. Its totient is φ = 228781788.

The previous prime is 228781739. The next prime is 228781799. The reversal of 228781789 is 987187822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223741764 + 5040025 = 14958^2 + 2245^2 .

It is a cyclic number.

It is not a de Polignac number, because 228781789 - 2⁷ = 228781661 is a prime.

It is a super-2 number, since 2×228781789² = 104682213956081042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228781739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114390894 + 114390895.

It is an arithmetic number, because the mean of its divisors is an integer number (114390895).

Almost surely, 2^228781789 is an apocalyptic number.

It is an amenable number.

228781789 is a deficient number, since it is larger than the sum of its proper divisors (1).

228781789 is an equidigital number, since it uses as much as digits as its factorization.

228781789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 52.

The square root of 228781789 is about 15125.5343376689. The cubic root of 228781789 is about 611.6089291410.

The spelling of 228781789 in words is "two hundred twenty-eight million, seven hundred eighty-one thousand, seven hundred eighty-nine".