225878581 has 4 divisors (see below), whose sum is σ = 226119564. Its totient is φ = 225637600.

The previous prime is 225878579. The next prime is 225878647. The reversal of 225878581 is 185878522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 185878522 = 2 ⋅92939261.

It can be written as a sum of positive squares in 2 ways, for example, as 57138481 + 168740100 = 7559^2 + 12990^2 .

It is a cyclic number.

It is not a de Polignac number, because 225878581 - 2¹ = 225878579 is a prime.

It is a super-2 number, since 2×225878581² = 102042266709147122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225878531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119080 + ... + 120961.

It is an arithmetic number, because the mean of its divisors is an integer number (56529891).

Almost surely, 2^225878581 is an apocalyptic number.

It is an amenable number.

225878581 is a deficient number, since it is larger than the sum of its proper divisors (240983).

225878581 is an equidigital number, since it uses as much as digits as its factorization.

225878581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240982.

The product of its digits is 358400, while the sum is 46.

The square root of 225878581 is about 15029.2574999565. The cubic root of 225878581 is about 609.0108316735.

The spelling of 225878581 in words is "two hundred twenty-five million, eight hundred seventy-eight thousand, five hundred eighty-one".