228180913 has 2 divisors, whose sum is σ = 228180914. Its totient is φ = 228180912.

The previous prime is 228180893. The next prime is 228180943. The reversal of 228180913 is 319081822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210482064 + 17698849 = 14508^2 + 4207^2 .

It is a cyclic number.

It is not a de Polignac number, because 228180913 - 2⁵ = 228180881 is a prime.

It is not a weakly prime, because it can be changed into another prime (228180943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114090456 + 114090457.

It is an arithmetic number, because the mean of its divisors is an integer number (114090457).

Almost surely, 2^228180913 is an apocalyptic number.

It is an amenable number.

228180913 is a deficient number, since it is larger than the sum of its proper divisors (1).

228180913 is an equidigital number, since it uses as much as digits as its factorization.

228180913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 228180913 is about 15105.6583107126. The cubic root of 228180913 is about 611.0730133299.

Subtracting 228180913 from its reverse (319081822), we obtain a palindrome (90900909).

It can be divided in two parts, 2281809 and 13, that added together give a palindrome (2281822).

The spelling of 228180913 in words is "two hundred twenty-eight million, one hundred eighty thousand, nine hundred thirteen".