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1221559 is a prime number
BaseRepresentation
bin100101010001110110111
32022001122221
410222032313
5303042214
642103211
713245253
oct4521667
92261587
101221559
11764859
124aab07
1333a021
1423b263
15191e24
hex12a3b7

1221559 has 2 divisors, whose sum is σ = 1221560. Its totient is φ = 1221558.

The previous prime is 1221557. The next prime is 1221589. The reversal of 1221559 is 9551221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221559 - 21 = 1221557 is a prime.

Together with 1221557, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610779 + 610780.

It is an arithmetic number, because the mean of its divisors is an integer number (610780).

21221559 is an apocalyptic number.

1221559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221559 is an equidigital number, since it uses as much as digits as its factorization.

1221559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 25.

The square root of 1221559 is about 1105.2416025467. The cubic root of 1221559 is about 106.8984683367.

It can be divided in two parts, 122 and 1559, that added together give a square (1681 = 412).

The spelling of 1221559 in words is "one million, two hundred twenty-one thousand, five hundred fifty-nine".