228521137 has 8 divisors (see below), whose sum is σ = 246544704.
Its totient is φ = 210561168.
The previous prime is 228521129. The next prime is 228521159. The reversal of 228521137 is 731125822.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 228521137 - 23 = 228521129 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 228521099 and 228521108.
It is not an unprimeable number, because it can be changed into a prime (228521177) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8293 + ... + 22930.
It is an arithmetic number, because the mean of its divisors is an integer number (30818088).
Almost surely, 2228521137 is an apocalyptic number.
It is an amenable number.
228521137 is a deficient number, since it is larger than the sum of its proper divisors (18023567).
228521137 is a wasteful number, since it uses less digits than its factorization.
228521137 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 31799.
The product of its digits is 6720, while the sum is 31.
The square root of 228521137 is about 15116.9155914823.
The cubic root of 228521137 is about 611.3765713833.
Adding to 228521137 its reverse (731125822), we get a palindrome (959646959).
The spelling of 228521137 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, one hundred thirty-seven".