223640897 has 2 divisors, whose sum is σ = 223640898. Its totient is φ = 223640896.

The previous prime is 223640869. The next prime is 223640903. The reversal of 223640897 is 798046322.

It is a happy number.

223640897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206468161 + 17172736 = 14369^2 + 4144^2 .

It is a cyclic number.

It is not a de Polignac number, because 223640897 - 2¹⁰ = 223639873 is a prime.

It is not a weakly prime, because it can be changed into another prime (223640827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111820448 + 111820449.

It is an arithmetic number, because the mean of its divisors is an integer number (111820449).

Almost surely, 2^223640897 is an apocalyptic number.

It is an amenable number.

223640897 is a deficient number, since it is larger than the sum of its proper divisors (1).

223640897 is an equidigital number, since it uses as much as digits as its factorization.

223640897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 223640897 is about 14954.6279458902. The cubic root of 223640897 is about 606.9930826364.

The spelling of 223640897 in words is "two hundred twenty-three million, six hundred forty thousand, eight hundred ninety-seven".