224399999981 has 2 divisors, whose sum is σ = 224399999982. Its totient is φ = 224399999980.

The previous prime is 224399999893. The next prime is 224400000047. The reversal of 224399999981 is 189999993422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204431483881 + 19968516100 = 452141^2 + 141310^2 .

It is a cyclic number.

It is not a de Polignac number, because 224399999981 - 2²² = 224395805677 is a prime.

It is a super-2 number, since 2×224399999981² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 224399999899 and 224399999908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (224399999081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112199999990 + 112199999991.

It is an arithmetic number, because the mean of its divisors is an integer number (112199999991).

Almost surely, 2^224399999981 is an apocalyptic number.

It is an amenable number.

224399999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

224399999981 is an equidigital number, since it uses as much as digits as its factorization.

224399999981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204073344, while the sum is 74.

The spelling of 224399999981 in words is "two hundred twenty-four billion, three hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".