225813581 has 8 divisors (see below), whose sum is σ = 259182144. Its totient is φ = 192722400.

The previous prime is 225813569. The next prime is 225813589. The reversal of 225813581 is 185318522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 225813581 - 2¹⁸ = 225551437 is a prime.

It is a super-2 number, since 2×225813581² = 101983546728087122, 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 (225813589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67595 + ... + 70856.

It is an arithmetic number, because the mean of its divisors is an integer number (32397768).

Almost surely, 2^225813581 is an apocalyptic number.

It is an amenable number.

225813581 is a deficient number, since it is larger than the sum of its proper divisors (33368563).

225813581 is a wasteful number, since it uses less digits than its factorization.

225813581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138691.

The product of its digits is 19200, while the sum is 35.

The square root of 225813581 is about 15027.0948955545. The cubic root of 225813581 is about 608.9524086900.

It can be divided in two parts, 22581 and 3581, that added together give a palindrome (26162).

The spelling of 225813581 in words is "two hundred twenty-five million, eight hundred thirteen thousand, five hundred eighty-one".