225821765 has 16 divisors (see below), whose sum is σ = 292795776. Its totient is φ = 166209600.

The previous prime is 225821749. The next prime is 225821807. The reversal of 225821765 is 567128522.

225821765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 225821765 - 2⁴ = 225821749 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14630 + ... + 25800.

It is an arithmetic number, because the mean of its divisors is an integer number (18299736).

Almost surely, 2^225821765 is an apocalyptic number.

It is an amenable number.

225821765 is a deficient number, since it is larger than the sum of its proper divisors (66974011).

225821765 is a wasteful number, since it uses less digits than its factorization.

225821765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11500.

The product of its digits is 67200, while the sum is 38.

The square root of 225821765 is about 15027.3672012099. The cubic root of 225821765 is about 608.9597652099.

The spelling of 225821765 in words is "two hundred twenty-five million, eight hundred twenty-one thousand, seven hundred sixty-five".