225503781 has 8 divisors (see below), whose sum is σ = 302866944. Its totient is φ = 149238240.

The previous prime is 225503743. The next prime is 225503783. The reversal of 225503781 is 187305522.

225503781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 225503781 - 2¹¹ = 225501733 is a prime.

It is a super-2 number, since 2×225503781² = 101703910490591922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225503783) 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, 273925 + ... + 274746.

It is an arithmetic number, because the mean of its divisors is an integer number (37858368).

Almost surely, 2^225503781 is an apocalyptic number.

It is an amenable number.

225503781 is a deficient number, since it is larger than the sum of its proper divisors (77363163).

225503781 is a wasteful number, since it uses less digits than its factorization.

225503781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548811.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 225503781 is about 15016.7833106828. The cubic root of 225503781 is about 608.6738015986.

The spelling of 225503781 in words is "two hundred twenty-five million, five hundred three thousand, seven hundred eighty-one".