225540101 has 4 divisors (see below), whose sum is σ = 226029804. Its totient is φ = 225050400.

The previous prime is 225540083. The next prime is 225540103. The reversal of 225540101 is 101045522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101045522 = 2 ⋅50522761.

It can be written as a sum of positive squares in 2 ways, for example, as 22335076 + 203205025 = 4726^2 + 14255^2 .

It is a cyclic number.

It is not a de Polignac number, because 225540101 - 2¹⁰ = 225539077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225540103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244160 + ... + 245081.

It is an arithmetic number, because the mean of its divisors is an integer number (56507451).

Almost surely, 2^225540101 is an apocalyptic number.

It is an amenable number.

225540101 is a deficient number, since it is larger than the sum of its proper divisors (489703).

225540101 is an equidigital number, since it uses as much as digits as its factorization.

225540101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489702.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 225540101 is about 15017.9925755741. The cubic root of 225540101 is about 608.7064778367.

Adding to 225540101 its reverse (101045522), we get a palindrome (326585623).

The spelling of 225540101 in words is "two hundred twenty-five million, five hundred forty thousand, one hundred one".