228121563 has 4 divisors (see below), whose sum is σ = 304162088. Its totient is φ = 152081040.

The previous prime is 228121549. The next prime is 228121571. The reversal of 228121563 is 365121822.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 228121563 - 2⁴ = 228121547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 228121563.

It is not an unprimeable number, because it can be changed into a prime (228121463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38020258 + ... + 38020263.

It is an arithmetic number, because the mean of its divisors is an integer number (76040522).

Almost surely, 2^228121563 is an apocalyptic number.

228121563 is a deficient number, since it is larger than the sum of its proper divisors (76040525).

228121563 is an equidigital number, since it uses as much as digits as its factorization.

228121563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76040524.

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

The square root of 228121563 is about 15103.6936873071. The cubic root of 228121563 is about 611.0200285766.

The spelling of 228121563 in words is "two hundred twenty-eight million, one hundred twenty-one thousand, five hundred sixty-three".