224721697909 has 2 divisors, whose sum is σ = 224721697910. Its totient is φ = 224721697908.

The previous prime is 224721697901. The next prime is 224721697939. The reversal of 224721697909 is 909796127422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224548038225 + 173659684 = 473865^2 + 13178^2 .

It is a cyclic number.

It is not a de Polignac number, because 224721697909 - 2³ = 224721697901 is a prime.

It is a super-2 number, since 2×224721697909² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (224721697901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112360848954 + 112360848955.

It is an arithmetic number, because the mean of its divisors is an integer number (112360848955).

Almost surely, 2^224721697909 is an apocalyptic number.

It is an amenable number.

224721697909 is a deficient number, since it is larger than the sum of its proper divisors (1).

224721697909 is an equidigital number, since it uses as much as digits as its factorization.

224721697909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6858432, while the sum is 58.

The spelling of 224721697909 in words is "two hundred twenty-four billion, seven hundred twenty-one million, six hundred ninety-seven thousand, nine hundred nine".