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225910921 is a prime number
BaseRepresentation
bin11010111011100…
…10000010001001
3120202002110112011
431131302002021
5430313122141
634230015521
75412132265
oct1535620211
9522073464
10225910921
11106580245
12637a75a1
1337a5a002
14220090a5
1514c76881
hexd772089

225910921 has 2 divisors, whose sum is σ = 225910922. Its totient is φ = 225910920.

The previous prime is 225910907. The next prime is 225910961. The reversal of 225910921 is 129019522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160300921 + 65610000 = 12661^2 + 8100^2 .

It is a cyclic number.

It is not a de Polignac number, because 225910921 - 215 = 225878153 is a prime.

It is not a weakly prime, because it can be changed into another prime (225910901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112955460 + 112955461.

It is an arithmetic number, because the mean of its divisors is an integer number (112955461).

Almost surely, 2225910921 is an apocalyptic number.

It is an amenable number.

225910921 is a deficient number, since it is larger than the sum of its proper divisors (1).

225910921 is an equidigital number, since it uses as much as digits as its factorization.

225910921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 225910921 is about 15030.3333629032. Note that the first 4 decimals coincide. The cubic root of 225910921 is about 609.0398951793.

The spelling of 225910921 in words is "two hundred twenty-five million, nine hundred ten thousand, nine hundred twenty-one".