228202913 has 4 divisors (see below), whose sum is σ = 228401988. Its totient is φ = 228003840.

The previous prime is 228202889. The next prime is 228202921. The reversal of 228202913 is 319202822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 319202822 = 2 ⋅159601411.

It can be written as a sum of positive squares in 2 ways, for example, as 96687889 + 131515024 = 9833^2 + 11468^2 .

It is a cyclic number.

It is not a de Polignac number, because 228202913 - 2²⁶ = 161094049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228202213) 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, 97808 + ... + 100113.

It is an arithmetic number, because the mean of its divisors is an integer number (57100497).

Almost surely, 2^228202913 is an apocalyptic number.

It is an amenable number.

228202913 is a deficient number, since it is larger than the sum of its proper divisors (199075).

228202913 is a wasteful number, since it uses less digits than its factorization.

228202913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199074.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 228202913 is about 15106.3864971078. The cubic root of 228202913 is about 611.0926515110.

Subtracting 228202913 from its reverse (319202822), we obtain a palindrome (90999909).

The spelling of 228202913 in words is "two hundred twenty-eight million, two hundred two thousand, nine hundred thirteen".