226397921 has 2 divisors, whose sum is σ = 226397922. Its totient is φ = 226397920.

The previous prime is 226397911. The next prime is 226397957. The reversal of 226397921 is 129793622.

226397921 = 10639² + 10640².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113209600 + 113188321 = 10640^2 + 10639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-226397921 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (226397911) 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, 113198960 + 113198961.

It is an arithmetic number, because the mean of its divisors is an integer number (113198961).

Almost surely, 2^226397921 is an apocalyptic number.

226397921 is the 10640-th centered square number.

It is an amenable number.

226397921 is a deficient number, since it is larger than the sum of its proper divisors (1).

226397921 is an equidigital number, since it uses as much as digits as its factorization.

226397921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 226397921 is about 15046.5252134837. The cubic root of 226397921 is about 609.4772202870.

The spelling of 226397921 in words is "two hundred twenty-six million, three hundred ninety-seven thousand, nine hundred twenty-one".