228365269981 has 2 divisors, whose sum is σ = 228365269982. Its totient is φ = 228365269980.

The previous prime is 228365269939. The next prime is 228365269999. The reversal of 228365269981 is 189962563822.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125879492025 + 102485777956 = 354795^2 + 320134^2 .

It is a cyclic number.

It is not a de Polignac number, because 228365269981 - 2²³ = 228356881373 is a prime.

It is a super-2 number, since 2×228365269981² (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 (228365269381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114182634990 + 114182634991.

It is an arithmetic number, because the mean of its divisors is an integer number (114182634991).

Almost surely, 2^228365269981 is an apocalyptic number.

It is an amenable number.

228365269981 is a deficient number, since it is larger than the sum of its proper divisors (1).

228365269981 is an equidigital number, since it uses as much as digits as its factorization.

228365269981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22394880, while the sum is 61.

The spelling of 228365269981 in words is "two hundred twenty-eight billion, three hundred sixty-five million, two hundred sixty-nine thousand, nine hundred eighty-one".