223870813 has 2 divisors, whose sum is σ = 223870814. Its totient is φ = 223870812.

The previous prime is 223870811. The next prime is 223870879. The reversal of 223870813 is 318078322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213802884 + 10067929 = 14622^2 + 3173^2 .

It is a cyclic number.

It is not a de Polignac number, because 223870813 - 2¹ = 223870811 is a prime.

Together with 223870811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223870811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111935406 + 111935407.

It is an arithmetic number, because the mean of its divisors is an integer number (111935407).

Almost surely, 2^223870813 is an apocalyptic number.

It is an amenable number.

223870813 is a deficient number, since it is larger than the sum of its proper divisors (1).

223870813 is an equidigital number, since it uses as much as digits as its factorization.

223870813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 223870813 is about 14962.3130898936. The cubic root of 223870813 is about 607.2010195959.

The spelling of 223870813 in words is "two hundred twenty-three million, eight hundred seventy thousand, eight hundred thirteen".