Search a number
-
+
1445165221 is a prime number
BaseRepresentation
bin101011000100011…
…0111100010100101
310201201022222222211
41112020313202211
510424430241341
6355222523421
750545462453
oct12610674245
93651288884
101445165221
11681838025
12343b96571
131a0533366
14d9d0b9d3
1586d17181
hex562378a5

1445165221 has 2 divisors, whose sum is σ = 1445165222. Its totient is φ = 1445165220.

The previous prime is 1445165209. The next prime is 1445165243. The reversal of 1445165221 is 1225615441.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1425893121 + 19272100 = 37761^2 + 4390^2 .

It is an emirp because it is prime and its reverse (1225615441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1445165221 - 211 = 1445163173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1445165521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722582610 + 722582611.

It is an arithmetic number, because the mean of its divisors is an integer number (722582611).

Almost surely, 21445165221 is an apocalyptic number.

It is an amenable number.

1445165221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1445165221 is an equidigital number, since it uses as much as digits as its factorization.

1445165221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9600, while the sum is 31.

The square root of 1445165221 is about 38015.3287635396. The cubic root of 1445165221 is about 1130.5918065878.

The spelling of 1445165221 in words is "one billion, four hundred forty-five million, one hundred sixty-five thousand, two hundred twenty-one".