225041981 has 2 divisors, whose sum is σ = 225041982. Its totient is φ = 225041980.

The previous prime is 225041977. The next prime is 225041983. The reversal of 225041981 is 189140522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174504100 + 50537881 = 13210^2 + 7109^2 .

It is a cyclic number.

It is not a de Polignac number, because 225041981 - 2² = 225041977 is a prime.

It is a super-2 number, since 2×225041981² = 101287786424808722, which contains 22 as substring.

Together with 225041983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225041983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112520990 + 112520991.

It is an arithmetic number, because the mean of its divisors is an integer number (112520991).

Almost surely, 2^225041981 is an apocalyptic number.

It is an amenable number.

225041981 is a deficient number, since it is larger than the sum of its proper divisors (1).

225041981 is an equidigital number, since it uses as much as digits as its factorization.

225041981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 225041981 is about 15001.3993013985. The cubic root of 225041981 is about 608.2580248971.

The spelling of 225041981 in words is "two hundred twenty-five million, forty-one thousand, nine hundred eighty-one".