Search a number
-
+
1222409 is a prime number
BaseRepresentation
bin100101010011100001001
32022002211102
410222130021
5303104114
642111145
713250606
oct4523411
92262742
101222409
11765461
124ab4b5
1333a526
1423b6ad
151922de
hex12a709

1222409 has 2 divisors, whose sum is σ = 1222410. Its totient is φ = 1222408.

The previous prime is 1222393. The next prime is 1222411. The reversal of 1222409 is 9042221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644809 + 577600 = 803^2 + 760^2 .

It is an emirp because it is prime and its reverse (9042221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1222409 - 24 = 1222393 is a prime.

Together with 1222411, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p94511 and since 1222409 and 94511 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1222499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611204 + 611205.

It is an arithmetic number, because the mean of its divisors is an integer number (611205).

21222409 is an apocalyptic number.

It is an amenable number.

1222409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222409 is an equidigital number, since it uses as much as digits as its factorization.

1222409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1222409 is about 1105.6260669865. The cubic root of 1222409 is about 106.9232570509.

The spelling of 1222409 in words is "one million, two hundred twenty-two thousand, four hundred nine".