225684309181 has 2 divisors, whose sum is σ = 225684309182. Its totient is φ = 225684309180.

The previous prime is 225684309173. The next prime is 225684309247. The reversal of 225684309181 is 181903486522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164234857081 + 61449452100 = 405259^2 + 247890^2 .

It is a cyclic number.

It is not a de Polignac number, because 225684309181 - 2³ = 225684309173 is a prime.

It is a super-2 number, since 2×225684309181² (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 (225684300181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112842154590 + 112842154591.

It is an arithmetic number, because the mean of its divisors is an integer number (112842154591).

Almost surely, 2^225684309181 is an apocalyptic number.

It is an amenable number.

225684309181 is a deficient number, since it is larger than the sum of its proper divisors (1).

225684309181 is an equidigital number, since it uses as much as digits as its factorization.

225684309181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 225684309181 in words is "two hundred twenty-five billion, six hundred eighty-four million, three hundred nine thousand, one hundred eighty-one".