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1221541 is a prime number
BaseRepresentation
bin100101010001110100101
32022001122021
410222032211
5303042131
642103141
713245226
oct4521645
92261567
101221541
11764842
124aaab1
1333a009
1423b24d
15191e11
hex12a3a5

1221541 has 2 divisors, whose sum is σ = 1221542. Its totient is φ = 1221540.

The previous prime is 1221533. The next prime is 1221551. The reversal of 1221541 is 1451221.

Adding to 1221541 its reverse (1451221), we get a palindrome (2672762).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 772641 + 448900 = 879^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221541 - 23 = 1221533 is a prime.

1221541 is a lucky number.

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, 610770 + 610771.

It is an arithmetic number, because the mean of its divisors is an integer number (610771).

21221541 is an apocalyptic number.

It is an amenable number.

1221541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221541 is an equidigital number, since it uses as much as digits as its factorization.

1221541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80, while the sum is 16.

The square root of 1221541 is about 1105.2334595008. The cubic root of 1221541 is about 106.8979432749.

The spelling of 1221541 in words is "one million, two hundred twenty-one thousand, five hundred forty-one".