228521361 has 32 divisors (see below), whose sum is σ = 333244800. Its totient is φ = 138710016.

The previous prime is 228521357. The next prime is 228521401. The reversal of 228521361 is 163125822.

It is not a de Polignac number, because 228521361 - 2² = 228521357 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228521351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 654615 + ... + 654963.

It is an arithmetic number, because the mean of its divisors is an integer number (10413900).

Almost surely, 2^228521361 is an apocalyptic number.

It is an amenable number.

228521361 is a deficient number, since it is larger than the sum of its proper divisors (104723439).

228521361 is a wasteful number, since it uses less digits than its factorization.

228521361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753.

The product of its digits is 5760, while the sum is 30.

The square root of 228521361 is about 15116.9230003993. The cubic root of 228521361 is about 611.3767711436.

The spelling of 228521361 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, three hundred sixty-one".