228138613 has 4 divisors (see below), whose sum is σ = 229333248. Its totient is φ = 226943980.

The previous prime is 228138601. The next prime is 228138619. The reversal of 228138613 is 316831822.

It is a happy number.

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 228138613 - 2¹³ = 228130421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228138619) 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, 597031 + ... + 597412.

It is an arithmetic number, because the mean of its divisors is an integer number (57333312).

Almost surely, 2^228138613 is an apocalyptic number.

It is an amenable number.

228138613 is a deficient number, since it is larger than the sum of its proper divisors (1194635).

228138613 is a wasteful number, since it uses less digits than its factorization.

228138613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194634.

The product of its digits is 13824, while the sum is 34.

The square root of 228138613 is about 15104.2581082290. The cubic root of 228138613 is about 611.0352509165.

The spelling of 228138613 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, six hundred thirteen".