228776521 has 2 divisors, whose sum is σ = 228776522. Its totient is φ = 228776520.

The previous prime is 228776519. The next prime is 228776543. The reversal of 228776521 is 125677822.

It is a happy number.

228776521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121881600 + 106894921 = 11040^2 + 10339^2 .

It is a cyclic number.

It is not a de Polignac number, because 228776521 - 2¹ = 228776519 is a prime.

Together with 228776519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (228776501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114388260 + 114388261.

It is an arithmetic number, because the mean of its divisors is an integer number (114388261).

Almost surely, 2^228776521 is an apocalyptic number.

It is an amenable number.

228776521 is a deficient number, since it is larger than the sum of its proper divisors (1).

228776521 is an equidigital number, since it uses as much as digits as its factorization.

228776521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 40.

The square root of 228776521 is about 15125.3601940582. The cubic root of 228776521 is about 611.6042347397.

The spelling of 228776521 in words is "two hundred twenty-eight million, seven hundred seventy-six thousand, five hundred twenty-one".