225993581 has 12 divisors (see below), whose sum is σ = 260201664. Its totient is φ = 194632200.

The previous prime is 225993577. The next prime is 225993583. The reversal of 225993581 is 185399522.

It is not a de Polignac number, because 225993581 - 2² = 225993577 is a prime.

It is a super-2 number, since 2×225993581² = 102146197306407122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225993583) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24485 + ... + 32426.

It is an arithmetic number, because the mean of its divisors is an integer number (21683472).

Almost surely, 2^225993581 is an apocalyptic number.

It is an amenable number.

225993581 is a deficient number, since it is larger than the sum of its proper divisors (34208083).

225993581 is a wasteful number, since it uses less digits than its factorization.

225993581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56960 (or 56941 counting only the distinct ones).

The product of its digits is 194400, while the sum is 44.

The square root of 225993581 is about 15033.0828840927. The cubic root of 225993581 is about 609.1141679630.

The spelling of 225993581 in words is "two hundred twenty-five million, nine hundred ninety-three thousand, five hundred eighty-one".