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1221457 is a prime number
BaseRepresentation
bin100101010001101010001
32022001112011
410222031101
5303041312
642102521
713245046
oct4521521
92261464
101221457
11764776
124aaa41
13339c73
1423b1cd
15191da7
hex12a351

1221457 has 2 divisors, whose sum is σ = 1221458. Its totient is φ = 1221456.

The previous prime is 1221449. The next prime is 1221463. The reversal of 1221457 is 7541221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 992016 + 229441 = 996^2 + 479^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221457 - 23 = 1221449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1221427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610728 + 610729.

It is an arithmetic number, because the mean of its divisors is an integer number (610729).

21221457 is an apocalyptic number.

It is an amenable number.

1221457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221457 is an equidigital number, since it uses as much as digits as its factorization.

1221457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 560, while the sum is 22.

The square root of 1221457 is about 1105.1954578264. The cubic root of 1221457 is about 106.8954929183.

Adding to 1221457 its reverse (7541221), we get a palindrome (8762678).

The spelling of 1221457 in words is "one million, two hundred twenty-one thousand, four hundred fifty-seven".