225220881 has 4 divisors (see below), whose sum is σ = 300294512. Its totient is φ = 150147252.

The previous prime is 225220867. The next prime is 225220907. The reversal of 225220881 is 188022522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 225220881 - 2¹⁸ = 224958737 is a prime.

It is a super-2 number, since 2×225220881² = 101448890476832322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225220861) 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, 37536811 + ... + 37536816.

It is an arithmetic number, because the mean of its divisors is an integer number (75073628).

Almost surely, 2^225220881 is an apocalyptic number.

It is an amenable number.

225220881 is a deficient number, since it is larger than the sum of its proper divisors (75073631).

225220881 is an equidigital number, since it uses as much as digits as its factorization.

225220881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75073630.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 225220881 is about 15007.3608939080. The cubic root of 225220881 is about 608.4191630362.

The spelling of 225220881 in words is "two hundred twenty-five million, two hundred twenty thousand, eight hundred eighty-one".