228138481 has 4 divisors (see below), whose sum is σ = 228230464. Its totient is φ = 228046500.

The previous prime is 228138479. The next prime is 228138503. The reversal of 228138481 is 184831822.

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 a cyclic number.

It is not a de Polignac number, because 228138481 - 2¹ = 228138479 is a prime.

It is a super-2 number, since 2×228138481² = 104094333025974722, which contains 22 as substring.

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 228138481.

It is not an unprimeable number, because it can be changed into a prime (228138401) 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, 42165 + ... + 47266.

It is an arithmetic number, because the mean of its divisors is an integer number (57057616).

Almost surely, 2^228138481 is an apocalyptic number.

It is an amenable number.

228138481 is a deficient number, since it is larger than the sum of its proper divisors (91983).

228138481 is an equidigital number, since it uses as much as digits as its factorization.

228138481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91982.

The product of its digits is 24576, while the sum is 37.

The square root of 228138481 is about 15104.2537385996. The cubic root of 228138481 is about 611.0351330691.

The spelling of 228138481 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, four hundred eighty-one".