225916961 has 4 divisors (see below), whose sum is σ = 239206212. Its totient is φ = 212627712.

The previous prime is 225916949. The next prime is 225916963. The reversal of 225916961 is 169619522.

225916961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 193210000 + 32706961 = 13900^2 + 5719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225916961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225916963) 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, 6644600 + ... + 6644633.

It is an arithmetic number, because the mean of its divisors is an integer number (59801553).

Almost surely, 2^225916961 is an apocalyptic number.

It is an amenable number.

225916961 is a deficient number, since it is larger than the sum of its proper divisors (13289251).

225916961 is a wasteful number, since it uses less digits than its factorization.

225916961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13289250.

The product of its digits is 58320, while the sum is 41.

The square root of 225916961 is about 15030.5342885740. The cubic root of 225916961 is about 609.0453229355.

The spelling of 225916961 in words is "two hundred twenty-five million, nine hundred sixteen thousand, nine hundred sixty-one".