227978813 has 2 divisors, whose sum is σ = 227978814. Its totient is φ = 227978812.

The previous prime is 227978797. The next prime is 227978833. The reversal of 227978813 is 318879722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227014489 + 964324 = 15067^2 + 982^2 .

It is a cyclic number.

It is not a de Polignac number, because 227978813 - 2⁴ = 227978797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (227978833) 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 as a sum of consecutive naturals, namely, 113989406 + 113989407.

It is an arithmetic number, because the mean of its divisors is an integer number (113989407).

Almost surely, 2^227978813 is an apocalyptic number.

It is an amenable number.

227978813 is a deficient number, since it is larger than the sum of its proper divisors (1).

227978813 is an equidigital number, since it uses as much as digits as its factorization.

227978813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 47.

The square root of 227978813 is about 15098.9672825660. The cubic root of 227978813 is about 610.8925507706.

Subtracting 227978813 from its reverse (318879722), we obtain a palindrome (90900909).

The spelling of 227978813 in words is "two hundred twenty-seven million, nine hundred seventy-eight thousand, eight hundred thirteen".