228521247 has 16 divisors (see below), whose sum is σ = 317623680. Its totient is φ = 145964000.

The previous prime is 228521231. The next prime is 228521263. The reversal of 228521247 is 742125822.

It is an interprime number because it is at equal distance from previous prime (228521231) and next prime (228521263).

It is a cyclic number.

It is not a de Polignac number, because 228521247 - 2⁴ = 228521231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228521947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1372 + ... + 21422.

It is an arithmetic number, because the mean of its divisors is an integer number (19851480).

Almost surely, 2^228521247 is an apocalyptic number.

228521247 is a deficient number, since it is larger than the sum of its proper divisors (89102433).

228521247 is a wasteful number, since it uses less digits than its factorization.

228521247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20214.

The product of its digits is 17920, while the sum is 33.

The square root of 228521247 is about 15116.9192297902. The cubic root of 228521247 is about 611.3766694799.

It can be divided in two parts, 2285 and 21247, that added together give a palindrome (23532).

The spelling of 228521247 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, two hundred forty-seven".