228115533 has 4 divisors (see below), whose sum is σ = 304154048. Its totient is φ = 152077020.

The previous prime is 228115529. The next prime is 228115543. The reversal of 228115533 is 335511822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 228115533 - 2² = 228115529 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 228115533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228115523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38019253 + ... + 38019258.

It is an arithmetic number, because the mean of its divisors is an integer number (76038512).

Almost surely, 2^228115533 is an apocalyptic number.

It is an amenable number.

228115533 is a deficient number, since it is larger than the sum of its proper divisors (76038515).

228115533 is an equidigital number, since it uses as much as digits as its factorization.

228115533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76038514.

The product of its digits is 7200, while the sum is 30.

The square root of 228115533 is about 15103.4940659438. The cubic root of 228115533 is about 611.0146447757.

The spelling of 228115533 in words is "two hundred twenty-eight million, one hundred fifteen thousand, five hundred thirty-three".