228861521 has 8 divisors (see below), whose sum is σ = 261648960. Its totient is φ = 196097328.

The previous prime is 228861511. The next prime is 228861547. The reversal of 228861521 is 125168822.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 228861521 - 2¹⁰ = 228860497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (228861511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30110 + ... + 36936.

It is an arithmetic number, because the mean of its divisors is an integer number (32706120).

Almost surely, 2^228861521 is an apocalyptic number.

It is an amenable number.

228861521 is a deficient number, since it is larger than the sum of its proper divisors (32787439).

228861521 is an equidigital number, since it uses as much as digits as its factorization.

228861521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11623.

The product of its digits is 15360, while the sum is 35.

The square root of 228861521 is about 15128.1697835528. The cubic root of 228861521 is about 611.6799708375.

The spelling of 228861521 in words is "two hundred twenty-eight million, eight hundred sixty-one thousand, five hundred twenty-one".